TimelessAren't STV and POV demos very very close to same thing nowadays? I've heard from AC admins that while POV demos are the best, STV is almost identical.
the mouse movements on an stv are slightly behind when shots get fired, which is what causes a "silent aim" sort of look when watching an stv
edit: also the POV of the player you're spectating in an stv's seems to be slightly behind where the player model actual is as well (this is VERY noticeable while watching stvs of jump maps, where rockets come out way in front of the camera when being synced, or look as though they should not be adding forward momentum, even tho they are)
here is a comparison of what that rocket syncing looks like on a POV vs the ROTW that used an STV i linked earlier
https://youtu.be/-LPSsif6n_U?t=305