Yeah what I meant was 40Str/18Dex might cause issues if you became interested in certain weapons, there are amazing dex weapons like the Katanas, Crow Claws & Quill (my favorites)and a few spears too that are pretty stylish and strong in PVE. The problem is, outside of the Exile being infused with heavy, 40Str/18Dex is more of a big smashy smash weapon stat spread. What about 30/30? Extra 2 points and a little underwhelming if you're used to 40/40 but it'll be strong and allow you to use every weapon that's worth using.
Taking any stat above 40 is little return for investment, it's the soft cap but the soft cap only really applies to PVP because of soul levels of course, so if you're willing to grind out the souls to keep your other stats strong, you can take any stat as high as you want. I've seen people with 99 strength at the SL140 PVP cap and the damage they deal is phenomenal compared to 40, but not 59 soul levels that could have gone into stam/hp better and it would be the same in PVE. If you take the Cathedral Greatsword for example, is predominantly a STR scaling weapon but has some DEX too, at 40 strength, going from 40 > 41 will give you a smaller increase in damage than a point being put into dex if dex is below 40. That's C strength and D dexterity. If you try it out on a Fume GS which is S/E respectively, it'll be around the same damage increase, which says even more imo.
Do what you want though, nothing wrong with overpumping a stat if you enjoy the stat, but if you go for 99 in strength, don't forget to get your strength cape! I doubt you'll get that reference