I have been a very long time user of Rapidweaver (Classic now) and had purchased literally 100’s of stacks which have made life much easier.
I have also been testing out Elements and found that some of the add-ons are excessively expensive. e.g. Gallery Pro $US129, Password Protect $US79, Portfolio $US99 and worst of all, Essentials for $199!
I am finding that functions that I need where in the past they were relatively cheap add-on stacks, now it is very expensive and the number of options are much more limited.
For example, I wanted a simple form and to save the data to e.g. a Google sheet, I have to jump through hoops and basically come up with all the code myself. Of course there is a suggestion to use services such as Zapier but that can become costly as well.
And on forms they are quite limited and the documentation for using things like reCaptcha is non-existent in the documentation.
Maybe if there were developers writing add-ons then it may be better but that seems to be very limited and then RW have set an expectation of high prices which will stifle adoption.
Now, having said all this I like the direction of Elements but it certainly creates a great deal of work when in the past I would simply find a stack that did what I wanted.
Some things I use are accessing MySQL data, forms such as offered by Formloom with numerous options, DateSnap for Google calendars (I had to write my own which is not as good as DateSnap), PDF displaying stacks etc etc.
Hopefully some third party developers will come on board. The Stacks world is rich with options but they seemed to have stalled with their alternative solution.