"With 20-25 new draftees in Rookie Ball every year, it's hard not to have enough players available."
Except the 6 yr minor league FA's are usually from AAA or AA - I personally don't want to fill my AAA team with Rookie League players - especially my top prospects that I want to bring along slowly.
Oh, for God's sake. It's really simple.
You get 20-25 new players each season. Year 1, they're in RL. Year 2, they're in LoA, year 3, they're in HiA, year 4 they're in AA, years 5 and 6, they're in AAA.
For your "real" prospects, the guys with major league potential, you might want them on a slightly different timetable, as you see fit.
"Once you see Rule 5 eligible players below AA, you know someone's not promoting properly."
I don't think this is necessarily true - why do you need to "properly promote" minor league filler that's never going to reach the majors? If it's a Major League prospect then I agree with your point .
It's absolutely true (see above). If you don't promote your guys, even the crap, they you risk lots of retirements at the lower levels, thus depleting your world of minor league filler. Which is the primary reason whay a lack of minor league free agents is such a pervasive problem in HBD. Seriously, using advanced roster moves, it can be done in 10-15 minutes at the end of every season. That's 10-15 minutes of your time every three months.