We are now in phase 2 as outlined in the top post. 
Our goal is to allow administrators to opt into using Web Forms for specific forms as part of the next Central release. You can read more about the initiative in this thread.
Thanks to everyone who was part of the geo-focused Insiders and data collectors calls – you all have helped solidify the vision for geo functionality in Web Forms. We plan to start implementation for that later this month.
We've added a number of features big and small over the past few months. Notably, attaching CSVs to forms (including Entity Lists!) is now fully functional and you can try it out in Central v2024.3+. You need a Central install to attach files but for all other functionality, you can try your own forms on the demo site. The demo site now has implementations for the range and rank question types which are not yet available in Central.
You can try these in the "All question types" form linked from the demo or try this form that shows selecting options to rank: filtered_rank.xlsx (10.6 KB)
Thanks for all the great feedback and suggestions so far, please keep them coming!