I like both. It depends on the author's intent. I don't like when MC has a voice but then it's cut out, but I mostly hear about such things in gacha-otome.
It's interesting when the MC has her own personality, and the whole point is the dynamic between characters, where a silent MC just doesn't work. Also, the MC's voice matters to me, I don't like too high-pitched voices.
If a work is created for self-insert, like the MC has little to no personality, then yes, I will, because what else is there to do? x) Or I might come up with an OC while reading/listening. If the MC has some degree of personality, then no. Instead I'll be more interested in her character...
I mostly try to avoid spoilers, but sometimes, if a route or plot is uninteresting to me, I may have a look at spoilers, and if I find them interesting, it can make me continue. But if not, I usually just move on.
I'm not a fan of shota as a LI, it makes me uncomfortable. I do like younger LIs, but only if the age gap isn't too big (in cases where MC is young).
Agreed.