This is just classic Loda execution in flashbacks. Add the current senile version of Loda on top, and we get what we got in this flashback. Clash and offscreen dogshit.
Anyway, this chapter definitively killed the cope of Roger not being a swordsman, not cutting etc. LMFAO
Also, high attack power necessarily won't be shiny.
Consider even Zoro. Ignoring Zoro growing heads and limbs, the Asura attack itself doesn't look visually appealing at all. He just slashes normally (visually speaking), but it's his strongest technique regardless. Compare that to dragon twister or shishisonson, they look like top tier shit.
Roger can use this technique and probably body some top tiers. And still have it look underwhelming lol.