"Feel" and Old School RPGs

Around here we've had a lot of talk comparing DCC and other old-school rules to D&D 5E and our recent Tales of the Valiant campaign. It has a very different feel from 5E D&D and its variants which tend to rapidly develop into superheroic levels of power. While that's fun, some of the group is very interested in the more bare-bones stuff where the answer to every problem is not "what class ability…