You as a designer probably have a pretty loose spec for a 3.3V regulator, why not just have the factory tell you the one everybody else is using and better yet here's the symbol and footprint.
We were careful not to restrict people though, you can use any parts but we try and gently nudge you onto the more popular stuff!
When I was a full time EE, answers to questions like this were just a phone call away. The part manufacturer's FAE (Field Applications Engineer) were happy to answer questions like that ("what's a cheap, low-dropout 3.3V regulator that can handle 100mA and won't be on allocation anytime soon?") and would be around the next day with samples.
Even for our tiny company, we got excellent service. Hell, I had FAE's visiting me when I was working out of my apartment! Has that changed these days?
Let's hope they are. It's a ton of work to even make this one little stepping stone but we hope it's headed in that direction as well.
The more companies like this develop a clean pallet of available parts (even if the excuse is price control) the better! While I'm sure many people will be quick to point out that solid EE is hard for good reasons, I think we're light-years from the point where we can say "we can't make useful prototyping any easier."
Perhaps this exists and I haven't found it, but I'd love not to have to even think about parts and assembly. I want to write a clean high-level spec for the functions of a board and have part choice, fab, and assembly taken care of for me. I see services like this and ciruits.io as great stepping stones on the way to that goal.