Today while I was lifting a weight using my bicepses
I came to a conclusion that I cannot further increase
its weight (and make my arms grow bigger) because of a pain
in my wrists / that is without strengthening them.

BUT it seems to me that strengthening them will make
them stiff and cause their moves to be imprecise,
which is harmful to guitar skills...

Has anyone had this problem before and managed to cope with it?