Reserved field handles are frustrating

[ryanleichty]

The 5.5 release now adds icon as a reserved field handle name, along with sectionId in the previous release. The number of reserved field handle names is really frustrating, and it continues to require us to update our current configuration.

I already created a discussion around an idea to handle this differently with prefixing system handles with _ (e.g.: _title, _icon, _sectionId, etc), though it sounds like it's not feasible. I just wanted to reiterate that this isn't a great DX experience.

#15593