"People who do not want to spend a lot of time learning the tool and being great 3D designers, but just get done what needs to be done."
I’m very much in that camp. CAD is not our main focus here, but we need the mechanical parts to make our instruments work. There is a tradeoff with any tool, though, where failing to learn the basics will cost you far more in time, workarounds, and errors than would spending a few hours making sure you understand how to use the tool effectively. We’re talking about basic concepts, principles, and logic here, not the esoteric or sophisticated capabilities that might take a lot of time to master. What is clear from your posts is that you are trying to build (and criticizing) without a solid foundation.
"To be clear, I do use components, I do make joints when they are useful etc. I even would like to design the components as separate files and link them to main design, but that simply just does not work reliably, and that is the reason I do not like most of the advanced features, they simply are not reliable and I spend all too much time fighting with the tool."
This forum, and particularly people like @TrippyLighting are incredibly helpful and put many hours into helping users understand what might be wrong- particularly if you can post a file. I very frequently- actually almost always- build components outside my main file and import them, and have zero issues with doing this. That’s not an “advanced” feature, it’s quite basic. It does require that you understand how to do this consistent with the basic operation of the software. Provide an example of what doesn't work and you will very likely get plenty of help quickly.
"It is pretty clear to me that the biggest source of my problems with Fusion 360 is the timeline, It just cause all too much delays when calculating it, prohibits deleting, causes errors, and couple of times complete crash of the model that each time took couple of days to recover."
You can create errors in the timeline if you don’t pay attention to the way a parametric design needs to be structured, particularly how geometry is referenced- this is something you don't need to think about much in direct modeling. There is lots of help for understanding this. This AU class from a few years ago is an excellent introduction and would be very helpful for the issues you are describing: https://www.autodesk.com/autodesk-university/class/Debugging-Your-Fusion-Design-Lets-Get-Rid-Red-and...
The timeline doesn’t prohibit deleting (though Remove is usually a better command), but if you delete something that subsequent geometry is referenced to then you will create errors. That’s not unique to Fusion, it's in the nature of any CAD system that pays attention to history. If you don’t want to deal with this, and don’t use the parametric capabilities, then you should just work in the direct modeling environment. I often work in direct modeling in the early stages of a design, but I’ve increasingly found that working in the timeline saves time and effort once a design direction is clearly established, by making edits easily flow through the design. This is only true if the design is well organized. You need to attend to the issues discussed in the class above. This also enforces a kind of discipline that will help create better results, in my experience.
"And how it clutters the browser if "turned off" is just not understandable, that those can not even be collapsed."
I’ve complained in the past about not being able to collapse these items, but as I mentioned above, the easy solution is just to delete them.
"And I realy would like to be able to delete unused sketches. I know it is terrible, that I do not manage the sketches, I just create a new one when needed, so a simple design can have 150 sketches, cluttering the browser, and I can not delete them without catastrophe on the time line. The biggest reason I create a new one is as I can not see the model as it is no if selecting an previously created sketch."
If you want to work like this, you should be working in the direct modeling environment, without the timeline. When Fusion doesn’t have to keep track of history it grants you far more freedom to move, edit, and delete sketches or anything else. What you are describing WILL create errors in ANY history based CAD system. Fusion gives you the option to work in a history-free environment.
As I mentioned above, I find working in the timeline very helpful in later stages of a design. When I need to alter some early part of the design- to accommodate a changed PCB outline, for instance, I know the changes will be reflected through the design. I can roll back to any point and make changes. But it does require that you think through and be intentional about the order in which you do things, how you manage sketches, and how you reference geometry. If you want to have a more free-form approach, direct modeling is ideal.
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