Mid-core in this game is an utter misnomer because every single static I've seen recruiting for midcore requires 3 nights a week at 3-4 hours a night. When Shadowbringers was coming out, there was a bunch of people recruiting for "casual" statics that would refuse anybody who didn't want to go six-seven nights a week, which can fuck right off.If I join a "mid core" group it is a roulette between some hardcore drop outs who suck too bad to be an esports raider but still think they're hot shit or they're basically casuals who maybe will try to clear the content after we've been wiping for a week straight while the rest of the time just not giving a fuck.
Actual casual statics are the true hardcore grinders of this game. If you can stick through an entire raid season with your tiny group of 3-4 competent players that don't give a fuck, and the rest filled out with people who are just happy to be there, then you're fucking golden. You'll see the content, and you'll clear through sheer tenacity. Requires low-drama personalities though that don't, say, grind learning parties in their off-time and then get pissed when their regular group just wants to bang their heads against a mechanic and chill.
On the flip side, the biggest problem with people that play this game hardcore - is the lack of flexibility. The idiot savant group I raid with can pull off some eye-popping recoveries when people fuck up because we're used to people doing dumb shit in progression. Hardcore players tend to get stuck on autopilot very easily and if shit isn't done exactly as they expect it, they can't really function.