The main problems I saw after playing a few of the classes this season is that they don’t scale with all stats, they can’t overpower, they can’t proc lucky hit effects, and they straight up don’t gain anything from some unique/aspects. There’s also a distinct lack of good aspects for minion-focused builds in the later world tiers and there’s no way to increase their movement speed.
Lots of little things add up to pets not keeping up with even basic builds.
I still love Summoner from lvl 1 to around NM40. But after that, they drop off fast due to aspects and uniques that work with abilities that actually scale with all of your stats.