OMG, I just realized I started wrong. Aside from the errors when renaming and adding variables into a complex struct. In data assets, you can attach directly functions and macros that will properly organize your blueprints. UE should put depreciation notes in the structure. Months of dev cost me a lot of time fixing struct errors. Thanks, man.
sadly we still do need structs for somethings, for instance savefiles since you cant save an object
For anyone still stuck with this, this video was pretty good! https://www.youtube.com/watch?v=aMGEqsGIrcI
It looks like this is how you make amend to your enum/struct:
1/ Save your project
2/ Make a change on your Enum or Struct and click on the save icon
3/ Close project and do not save all the extra stuffs (you saved all in point 1)
To get rid of the errors on the structs:
1/ Open all BP with the error
2/ COMPILE
3/ SAVE
I hope this helps! It worked for me on UE 5.3