I don't think fleet training is completely pointless. Sure, you'll reach 100% eventually, but being able to reach it faster is a good thing when you're doing a lot of buildup and want to get your new ship crews able to fire on command before starting a war with someone. That said I do think it probably depends somewhat on game settings, if you play with 10% speeds for everything then the game will go by so slowly (in game time, in real time of course you're clicking "30 days" on repeat) that the time to reach 100% training is unimportant. Playing at full speeds where the galactic situation can change completely in a couple of years, then that quicker training becomes more valuable as you want to have good crews in shiny new ships right when you need them.
I do think the micro could be reduced though, particularly given that it is not needed for balance and honestly fleet training is probably overcosted for its actual benefits - since we can reach 100% eventually anyways, the cost in micro and MSPs is only paying for the time savings. I would like if training kept the fuel usage and maintenance failure rate but did not advance the deployment or maintenance clocks, instead taking a fleet out of training should have the same modifier as taking a ship out of overhaul prematurely so there is a motivation to keep some ships at the ready and not just chuck everything under a training command at the start of the game.