If there was someone else to play, then I guess it would make sense. We didn't have someone else to play, so Garland got those minutes.
I dunno, I have a hard time seeing RJ Barrett or Deandre Hunter having better years. The perception is weird because RJ who had a horrible season by all accounts, didn't improve much, but if you look at Darius' numbers at the end of the year they are much better month by month. I'd rather have him than either of those guys right now, when I wanted both over him before the draft. I am just not sure what I am seeing. Like I looked at his numbers vs Devonte Graham, and there is no way I would trade 20 year old Garland for 24 year old Graham, but people are high on Graham, and i didn't see it in the film, and I don't see it in the numbers.
What is Garland worst at? Probably defense, but that is a hard thing to tease out on this team where everyone is a bad defender by the numbers except Nance. Next I would say turnover, which were bad, but were greatly reduced later in the season. That is also the area young player improve the most.
What metrics are you using to see how bad he was? I am just curious. I am not sure I buy advanced stats for rookies. With Sexton he had such a bad start his whole year numbers didn't tell the story and while I agree you can't expect Darius to have the same obsessed drive Sexton had, I did see some of the same things which was a guy who wasn't ready being thrown to the Wolves, who didn't really get his legs until after Christmas.
I'm hedging a bit because, yeah, I don't totally trust advanced stats either (at least, not if we're talking about discerning small differences in bad-ness). But yeah, while Hunter and Barrett were similarly bad on offense, they both have an edge on Garland on defense, both by the stats and by the eye test. Being 6'6"/6'7"-ish instead of 6'1" is a big advantage on D.