P: All changes to default behaviors in new releases need option toggles and FTUE blocker dialogs

Please, please, please add a "Legacy settings" preference toggle somewhere any time default behavior is changed for a tool or commonly used UX paradigm in a software release.

Additionally, add a blocking dialog on startup which calls out this change and has the opt-out checkbox available. The current external "What's New" web page is insufficient education.

This is most prevalent in Photoshop recently, but affects all Adobe software generally.

Examples of changes that were extremely disruptive to common users (forums exploded with questions and complaints):

2017-18
Changing the move tool default behavior for auto-select
Select and mask "workspace"

2019 
Changing the shift-to-lock-aspect-ratio behavior of the transform
Click-to-commit on transform tool
Click-to-edit on text

I love that Adobe continues to innovate and re-examine long established and potentially out-dated UX and UI. It is just very important that consideration for long time users is also a priority.