I see your point about the crispness of the font, but this is because the file is just storing the text data, and the pdf viewer is applying the font (assuming the person viewing it has that font). Aside from the fact we like to have the same font on all our drawings as it forms part of our branding, this can lead to issues. I have received drawings from several different third parties saved in this way where some of the text is replaced by '.................', and I receive error messages about missing fonts. Also you will notice how it resizes the font, which depending on the drawing could cause additional problems.
The built in drivers also make it very easy for someone to turn your pdf drawing back into a cad drawing (especially with the built in import feature since 2017). I admit I find this useful when I do it to other peoples drawings, but I don't want others taking my drawings from planning (all public domain here in UK), converting them back to CAD and using them as their own.
The file size is an issue as many companies/individuals still have email size limits of 9mb, which is actually closer to 6mb due to archaic email infrastructure. So if my drawings end up at 1mb or more each and I need to send a package of more than six drawings this is an issue. Obviously there is dropbox etc., but often it is easier/quicker to just attach a drawing set to an email.
If I may ask, what do you do that means filesizes are irrelevant to you?
Also, although I do appreciate that you have taken time to reply several times in this thread, your focus has consistently been trying to prove that this problem isn't a problem, rather than trying to find a solution. Despite the fact that several others have posted that this is also an issue for them.
I think perhaps you are assuming that the requirements you have of the software are the same for all AutoCAD users, when there is likely a wide variety of different demands and priorities depending on the intended use.
