Someone who doesn't have the time to complete like a 30 minute dungeon should not be queueing up for a dungeon. It's as simple as that. This has nothing to do with casuals, little people or anything, MMORPGs simply aren't meant for people that can only play 10 minutes at a time. You got single player games with a pause/save button for that, not MMORPGs.

Saying that you should be able to do dungeons in 10 minutes because you don't have enough time otherwise is the same as saying that Coil should be super easy and doable in AF gear with a random GC weapon, because you want to do it and having to farm DL/Relic is mean and SE is screwing over the, what was it? "Little guys"? Simply no. Just like Coil wasn't meant to be completed by everyone, dungeons are not content for people that have no time. The one to blame here are not SE, it's people like you that expect to get everything, even though you don't want to put in the work you should.