As a casual player I wish sometimes that older bosses were easier to solo.

I don't want them made weaker or to have fewer hp or anything but the forced phases that cause them to become invulnerable to harm and drag out a fight are really, really tiresome.

This seems to happen especially often with ARR bosses. Except Cuca Fera. I think it might be actually impossible to solo Cuca Fera if you are not a red mage or healer.