Doughs with 50%–66% hydration are relatively low in moisture and therefore very easy to handle.
I cannot stress enough that hand mixers are not designed to manage high-hydration dough effectively. Or the fact that a mixer isn’t required at all to make excellent bread.
King Arthur Baking Company’s Head Baker, Martin Philip, only included two mixer-based recipes in his cookbook—one of which isn’t even a bread dough. In
this video, he discusses the strain bread doughs can place on stand mixers, even sharing that he had to replace a stripped gear on his own mixer due to mixing heavy doughs (around the 3:40 mark).
Using a hand mixer for 22 minutes in place of stretch and folds isn’t just inefficient—it’s unnecessary. Each set of stretch and folds takes about 30 seconds and very little effort. Altogether, three sets require only about 90 seconds of hands-on time and simply involve lifting one side of the dough, stretching it gently, and folding it over itself. There’s no kneading involved.
I bake bread and rolls multiple times a week using anywhere from 72% -80% hydration. I don’t knead any of the doughs.
It is bit of an effort to work butter into brioche. So I understand your use of a mixer for enriched doughs. But as your experience with the 80% hydration dough showed you, a hand mixer is ineffective and exhausting work.