See whilst this may be true, with all of these there is a grander goal at play, e.g., in doing Skirms/NMs, you build up Lost Actions, items for relics, and there is a level of actual character progression involved, since this usually involves weapon, gear or collecting Mettle to eventually make yourself stronger, it's the same with doing deep dungeons, you build up Aetherpool, you can get a weapon which may be stronger, and you climb floors, with the goal of eventually reaching the highest, and due to the randomization involved with floor generation, and how certain classes interact with the content, it means there is still more of a reason to go for higher floors.
This is what Square Enix failed to understand with V&C dungeons, it's what they partially fail to understand with any content they release. Players like and want character progression. Grinding more a minion, a mount or an orchestrion role just doesn't have the same level of incentive as character progression. A mount, minion orchestrion role is like a nice little side checklist, and another issue you have with many of these is you have your things you can grind 10-25 FATEs on, e.g., for a minion for that zone with the gemstones, but then the next stage up from this is 50,000 gemstones, which is the equivalent to around 3200 FATEs, give or take on napkin math. There's no goal between that, which is what makes the distinction between doing something like Skirmishes/NMs and FATEs (even if you can argue they are technically the same thing), they just don't have the same goal posts with them. People still want that progression to actually matter in some shape or form.
I am fine with content involving miniature 10-20 minute activities, but there still has to be a goal at play to mean that you repeat that content, otherwise it's just a hollow and soul-less experience, which is what most of the content is. Again, going back to your example a lot of them are... You do it once, then it is done, like literally done, either for the patch (e.g., story quest), or for the day (e.g., roulette/beast tribe), or for the week (e.g., Custom Delivs)
My actual play-time outside of joining friends, and helping friends is perhaps a couple hours on the weekdays, and maybe a bit more on weekends, outside of that I am doing other things, whether this is personal IRL goals, studying, other games, or learning new skills, and even on that I am really struggling to find a valid excuse which isn't just dopamine play with seeing my gemstone voucher count increment every 6-7 FATEs, until I have done a good 3000-odd for a mount that will probably never get used outside of a checklist.