Was that a reply to my post?
I’m a murmillo now and I built my char with ~100 CON and rest into DEX (so nearly full DEX).
It’s not a bad way to build it but the lack of STR will seriously gimp the use of your lower rank skills. As an example, Peltasta’s Umbro Blow would be considerably stronger if you invested in high STR due to all multipliers it gets (330% bonus dmg from High Guard, 400% from Murmillo’s Crista attrib, 100% extra with High Kick debuff, 100% with Slithering debuff, 50% with Headbutt debuff). All those multipliers mean you are getting a lot more than just 1 dmg from each point invested in STR (even if Umbro Blow is a single-hit skill).
Picking STR makes low base-atk skills become considerably stronger (given they have good multipliers to combo with) but picking DEX will benefit more higher base atk skills with little multipliers.
So in short, high STR benefits more Peltasta, Shinobi and Rodelero skills while high DEX benefits more Murmillo skills.
Note that I’m talking about pvm. In pvp you’ll need both STR for block pen and DEX for accuracy (so if you’re a pvp build you’ll need both).
I can’t tell you for sure which build (STR or DEX) would give you more dps spamming all skills you can as fast as you can. I have a feeling STR would have more dps because it benefits a lot more skills than DEX does (even if they aren’t rank 8 skills, they win by quantity).
DEX is still a good option even if it’s not best dps cause it still gives you nice survivability through evasion, though.