P: Transform/Resize is constrained by default - Want ability to go back to legacy behavior

It's also inconsistent! I worked out quickly that constrained was the new default - sure, I'm ok with that as it is an attempt to standardize across apps - but then I go to resize something else and it requires the old key combo?!! Is there a bug where old documents or elements from old documents retain the old restraining defaults?! It's the only explanation I could come up with...

Thank you dearly, John.

Do you think users should be informed of such a major change in one of the most used features of Photoshop?
This wastes time in retraining muscle memory for millions of users, and by the looks of things, you've failed to provide an easy way to turn this off.
It is baffling when these kinds of decisions are made.

Particularly unnecessary since SHIFT is stilled used to constraint other things like brushes to a straight line and cropping. Retrain to not use SHIFT for only one tool (?) 

Very handy to know before updating.

How do I turn off the new proportional scaling by default behavior while transforming layers?

To revert to the legacy transform behavior, do the following:

1. Use Notepad (Windows) or a text editor on Mac OS to create a plain text file (.txt).
2. Type the text below in the text file:
   
   TransformProportionalScale 0
   
   
3. Save the file as "PSUserConfig.txt" to your Photoshop settings folder:
   • Windows: [Installation Drive]:\Users\[User Name]\AppData\Roaming\Adobe\Adobe Photoshop CC 2019\Adobe Photoshop CC 2019 Settings\
   • macOS: //Users/[User Name]/Library/Preferences/Adobe Photoshop CC 2019 Settings/

new feature, use Shift to *un* constrain.  Constrain to fixed aspect is now on by default.