TBH I don't care for hydraulic disc brakes much.

My -favorite- setup for Discs, at least use to be, Avid BB7s with Avid Speed Dial levers, with Flak Jacket Housings.

That combination was super simple to 'dial in' (Hydraulic brakes tend to be a lot more inconsistent on 'feel' unless you are very persistent about bleeding and know how to use a disc tuning fork) and honestly had a lot less overall drag than I've experienced with most hydraulic discs. Replacing cables is way easier than re-doing hydraulic lines, also you don't have to worry as much about overheating janking up your fluid. Only drawback is, yes, make sure your cables are set up right and clamped down good.

But yes, Coaster brakes suck, especially since 'failure' means either rebuilding the wheel or outright replacing, because nope, not gonna do that sort of hub job.