i do think it's really hard to sit down and grind sessions on a relentless game for hours! especially as i've gotten older...i think i've gotten better at practicing in return, though, so even though i tend to make my priority just doing like 20-30 minutes each day and more at least a couple times a week if i'm trying to learn more and improve in an arcade game or something similar i feel like i see more consistent and rewarding progress than back when i just used to kind of mindlessly mash shmups for hours and hours.
and i think the other side of that is, when i a game like that for an hour or more, even if i was getting blown up pretty hard, i generally feel really good at the end of it! (i'm still trying to get that more often out of fighting games though...) i spent a while time absorbed in a cool game and i learned a lot! there are plenty of games i bought and didn't play for very long in the grand scheme of things, just saw them through and tried to learn a few things about, that i still think pretty highly of and don't at all regret spending the money on them.
but to be honest i'm being more than a bit sardonic at the same time because i do notice that what people mean by "wasting their time" is feeling like they spent time playing that didn't get them closer to "done" or "seeing everything", not..."spending time doing things that have no meaning." i find a lot of character building mechanics in rpgs really tedious and there's cases where i know people who LOVE stuff like the ffx sphere grid that to me feels like it should've basically been automated, and i often feel stuff in newer games manages to be worse than that...
but at the same time i love doing nothing at all. being lost and wandering to see what might happen, or spending time in a virtual space with or without other people, while not engaging with the primary mechanics of a game. and i think there's a mindset of consuming games as content that leads people to reject those kinds of experiences. and it's not that i don't understand the kinds of motivations that people have in playing games like that since i've had them too; wanting to see "the best" the medium has to offer, talking to people about things while everyone's excited about them, wanting to prove yourself and your skills, etc. i've spent lots of time doing all of those things, and i feel like it's left me only more excited about things that aren't the newest, most crowdpleasing or best-crafted. games where i can find emotions and experiences i haven't had before and don't get from other things, or where i might discover something i didn't expect about myself or the world from the way i've gotten to interact with it. for me a lot of what people view as "tightly" designed or highly replayable games are like the antithesis of that, and at the same time they're all too often really padded out compared to arcade games, so i end up not too warm on them a lot of the time. so i try to share those feelings in the hope it'll open people's minds a bit, or even if i play something that is really popular but i feel like the part that really caught my attention was something weird or awkward, that's the kind of thing i like to point other people towards as well...