IIRC bombardment did have interwave cooldown when introduced. It was changed later (probably at the beginning of the year). Left unnoticed cause platoons used to be filled. Lower GP guilds (which couldn't fill platoons) must remember better.
It was a thing when DS TB started that was changed due to numerous complaints:
"The Strafing Run ability will no longer fire at the start of a wave".
But soon bombardment at the start of every wave was introduced in LS TB (without any notification about change ofc). To make LS TB more challenging probably. And with new platoons this challenge can amuse a lot of guilds