Have a 2nd yr prospect that is absolutely ML ready but am I risking maxing his development by bringing him to the majors this early? Want to get him as close to max as I can long term.

Better coaches help development. Games played, too. So as long as you are playing him every day (if it is a position player) or getting him a lot of appearances (as a pitcher), you should be good.

All true but I would add one caveat: just keep in mind he will get to salary arbitration sooner, and if he's got a lower patience rating (say <60) he'll head to free agency at a younger age.

If he can help and play bring him up. The early arb. & FA don't make much of a difference. If he's a hitter I'll take a guy from age 20-30 over age 22-32.

Bringing him up! Thanks for the help. What’s the deadline on avoiding a year of service? Is it waiting until we have played our 20th game?

I agree about bringing him up so long as he can get consistent reps and keep developing. The key thing is to ensure that you have control over him around the window when you are trying to compete for a WS.

The more nuanced situation that would give me pause is if he's a HS/IFA prospect who is only 19-20, and while he might be good / good enough at the ML level, I would need to understand whether I would want those 6 years of ML control (1 partial year, 3 full years, 2 arb years) to be entirely when he has matured vs. 1-2 good years plus 4-5 mature years. If he is 21 or older, I would probably just call him up since he's already going to be pretty close to peak and I'd rather have the chance to extend him long-term so I have him locked up through his age 31 season.

Once drafted a guy 4th overall. Saw him as mid 80's pre-draft. Turns out that was his floor. He was an 84 overall after he signed. Started him immediately in the Major Leagues. Never played one day in the minors and went on to a HOF career. Let him play if he is good enough.