Keep in mind I'm not a programmer and may not fully understand. But Revit in itself has some bugs, so the probability an addin adding a problem exists. I agree this likely is a small probability. I've never had a problem with lack of memory... Revit also manages to crash without memory leaks.
But the larger problem I see is that I think some of these add-in functions should be included in Revit. I'm not talking about wanting to have full new features... but hiding an item in all views seems a pretty basic requirement. This is like buying a car and I need to buy a separate radio. Of course, the radio is not needed for driving. But nowadays considered basic requirement.
Another problem are the updates. Many of the addins still don't have 2016 versions. So what would I do assuming I wanted to be on the newest version of Revit? Doe sit mean I can't upgrade before the last addin has an update? I'm not sure if all addins require subscritption to give me the new versions, but I assume most of them will charge me every year if I want to have the new version compatible with the latest Revit version. In addition I need to keep track of the cost for updates, pay for all of them and even if it is little deal witht the receipts, etc. All of sufdden I don't only depend on A-desk, but on many small developpers gettign their updates ready in time. The above recommended addin is up to 2015 only, which serves as a good example for my point.
Revit Version: R2026.4
Hardware: i9 14900K, 64GB, Nvidia RTX 2000 Ada 16GB
Add-ins: ElumTools; Ripple-HVAC; ElectroBIM; Qbitec