[NoOne]

I regulary "rush" playrs. Age does matter, but if they are developing fast and still performing okay (I have a low bar for okay - basically not falling on their face stats-wise), they usually keep doing fine.

1. Being at the same level for too long harms morale which hurts development.

I think the semantics are off a bit here. If they are over-rated or under-rated, I'd agree that it's a potentially negative effect or an opportunity cost lingering where they do not belong. I'd wager there's a soft-cap effect but i've seen players stuck in A ball nearly fully develop, too, but i wouldn't advise that strategy, lol..

Coincidentally, the players that stop developing tend to linger in one spot and may create a false perception of cause and effect, here. A lot of players fail to develop and it's not because they were in one league for too long... because tehy failed to develop they stayed in one leage because they never earned a promotion... cuase and effect... Ratings are a cause to an effect, not the other way around.

2. Prospects get potential dev boosts each individual level that they're promoted.

Again, sorta true. Relative to probability of an improvement occurring, a player can develop either higher or more quickly at higher levels. Whichever it may be it makes it important to put them where they belong and where they don't fall on their face performance-wise. MLB has the best development potential for a player. You can definitely find words to that effect in the forums of previous versions made by markus or lukas or someone else near the top of their hierarchy.

There could be any number of other factors that influence the 'development rate' of the player. Age and level seem to matter, but some can do fine as a 19 year old in the MLB -- usually it takes a year to be mlb-ready ratings-wise even for the ones that hit the 'lottery' with the RNG and skyrocket in ratings quickly. I wouldn't doubt someone has an example of an 18 year old making it the first season or a international amatuer getting to ML level at 18.

It's worth it to keep promoting players whose ratings and stats are good enough to do so.. doesn't have to be crazy-good stats, either. due to small samples sizes anything but utter and total failure is fine.

I'm a big fan of "rushing" players and have simmed a crazy number of seasons even if not with recent versions it's still working in similar ways. Probably even faster with dev lab addition. Anytime you can, it is worth it to get players mlb-ready ASAP. It helps so much financially and avoiding bad contracts /bad ages etc.. it's a domino effect of benefits to get players to the MLB at younger ages. You can't force a square peg through a round hole, but when the oportunity arises, take it. So, it's not really rushing so much as letting it happen when it happens.

Sometimes you promote that 18-19 year old and they absolutely fall on their faces. 3k a game, no power, no walks, bla blah blah. Ratings look fine, but being too young for a level seems to have a major effect for some but not all. You demote them for a month or 2 and try again. Rinse and repeat anytime they hit a speedbump. The 2nd attempt usually goes well enough. Again the bar for 'okay' is very low. I don't want to be setting MiL statistical records. That's waiting too long to promot high-potential players if they do.

Stats have very little effect on ratings changes, but there may be some nuance to that. I always fear extremely bad performance. The outier kind of bad. It's served me well. So, i never worry about under-performance impacting development, only outlier bad results.

MiL stats don't matter. Good development is all that matters. So if ratings are skyrocketing and they are hitting for an ops+ of 70, oh well, so be it. They are where they should be due to ratings sky-rocketing.

Probably not going to put up with shoddy numbers at the ML level where it matters, but in the MiL stats are nothing... less than nothing but a tool to judge utter and total failure performance levels and to avoid it. So, slight underpermance hurting a team is worth it in the MiL. It improves your ML team in the future.

Obviously, I'm not putting in that kind of effort to get a future bench player to the mlb, i don't care how old they are as i'll always have plenty of league-minimum options of equal or greater ability to replace them (part of my strategy despite low priority). Any player of real value that can contribute everyday to a playoff caliber team, i'm hand-tailoring their promotions as best i can to develop them ASAP. promoting as soon as they don't fall on their face is defnitely part of that strategy.