uh no, this is 100% irrelevant, especially for competitive since it literally adds nothing.
You're free to leave/take a break, and this also dodges the important stuff discussed here.
We never had a 100% loyal metagame vs handhelds, no legendaries, access to abilities, stats, movepools and items we shouldn't be allowed to, so not really relevant either, even in gen3 we had access to band items after a while.
The problem here is that it doens't seem they placed any thought behind this nerf (pls don't say it ruined pve when you literally complete all pve with a starmie and a pinsir/scyther and is not relevant the least), this nerf didn't change 1 hour matches, but served as a nerf to a lot of playstyles, it literally didn't add anything good, but removed a lot as a whole, and I say this as a very offensive player, you'll rarely if ever see me run stall. Effectively speaking this hurts more balance and bulky offense than stall as a whole, especially after the introduction of a new regen mon, aswell as some HA like toxic heal gliscor. We don't even have access to heavy duty boots or something to remove/lessen the burden on some walls etc, that now struggle pretty hard with limited healing pp, nothing, straight nerf.