I'm not a fan of this loose, clicky use of the term "backmasking" to label all reversed audio. It implies some kind of "hidden" (possibly Satanic!) content, which is usually not the case.
Zappa reversing an entire passage in "Mother People" because the lyrics had been censored, fine, let's call that backmasking.
But any of that Beatles stuff? Call it reversed audio. There's no hidden message being "masked", it's just a production technique.
I strongly agree, it's just a production technique. I've played around with it a couple of times, but usually it makes very little sense, to try to hide any messages as 2022 gives you so many platforms, where you can share you real message, rather than trying to cover it up into something intended for the subconscious.