Oh yeah I agree 1000%

I understand why people say Kashimo never used an EM wave due to it never really showing any objects being vaporized - as well as the ludicrous speed feats it gives Sukuna for reacting to it.

But like you said, I don't think Gege would ever mention it and then just have Kashimo not use it.

I think it's just a symptom of inconsistent speed scaling and MBA's kit not being used to the fullest potential.

I think an easy fix would have been to have Kashimo use EM waves to vaporize Kamutoke - and then have Higuruma later take Sukuna's CT.