A pie-menu is not the best option for snapping abilities discovery.
Currently Shift Ctrl Tab panel allows you to shift click to combine several snapping methods. A pie-menu does not allow that.
It would be better if panel does not disappear after first click.
Now, there are 2 new edge methods (for a total of 7).
There are 4 options that are specific to method used and 3 buttons to enable/disable specific transforms.
In Delete pie-menu, you only deal with operators at same level. Clicking on one option does not disable others.
So, that means 2 more options to display and no way to nicely expose to what level each option corresponds to.
Shift Tab to enable/disable snap.
Shift Ctrl Tab for snap target.
It is not hard to remember almost same key combo.
But if you don’t want to use all complexity of new snapping features ; you can still write a pie-menu for that.
I think that meta-androcto just tried to encourage people to use Shift Ctrl Tab to discover new features.
If a simple pie-menu for snapping become popular among community members ; maybe, meta-androcto will consider adding it in 2.82.
In default keymap, Shift O to change Proportional Edit Falloff is a pie-menu.
It was not removed. You just don’t need an addon anymore for that.
You can set O key to enable/disable PET to Click instead of Press and remap Shift O to O by choosing Click Drag.