Why is more isolation negative, should be a spectrum, 98% alone and the rest socialising.
For some people, more social isolation is OK. For others, not so OK. YMMV .
I personally think that more socializing is better, if it's with people who I become better by being around. The tough part is knowing who's good for me, and how I can find them.
Preferring something doesn't mean it's good for you.