Exactly. In both games, Siz 16+ seems a must-have for fighter types, as it contributes to both Hit Points and damage bonus.That's like the RQ2 breakpoints. 13+, 17+, and 21+ for skill bonuses. Str+Siz=25+ for damage bonuses. Siz 16+ for the best SR. Forget the breakpoints for hit points in locations, but getting 4HP or more in the arms was pretty important. At the less heroic end on things, having the stats to use a greatsword or a 1-H bastard sword was considered fairly desirable, so that was another set of Str & Dex breakpoints.
Mythras as less breaking points though, as skill bases are the sum of 2 characteristics. DEX 16 or 17 only means 1% difference in (a lot of) skills.
Iit doesn't have minimum Str/Dex for big weapons either, so you can sacrifice it.
As a matter of fact, the following seems optimal to me in Mythras for a fighter type with 80 points:
Of course, it has flaws, and is boring to play...