Skipping wifi 6 seems like a smart move, with 6E on the horizon. It includes all the things that should have been part of the standard in the first place, so why get your hardware certified for 6, if you have to get it recertified for 6E anyway shortly after?
6 doesn't add very much over 5 in real world setups, very few devices even support 802.11ax yet, and the bleeding edge has never been Mikrotik's target segment.
6E gear is not really available anywhere yet, so it's really only an issue for people who just have to have the latest gear at all times. For the majority of people, 802.11ac/wifi 5 is what their hardware supports, so that's what they need.
As far as I know, that concerns 802.11k/v/r, MU-MIMO and beam forming, which many other 802.11ac devices also don't support, so it doesn't bother me. Then again, I'm not running an enterprise setup and I've never been one to meticulously make sure I get every single feature in the world on a spec sheet.
The hAP AC² serves my home networking needs quite well, with an additional AP to better cover the whole apartment.
6 doesn't add very much over 5 in real world setups, very few devices even support 802.11ax yet, and the bleeding edge has never been Mikrotik's target segment.
6E gear is not really available anywhere yet, so it's really only an issue for people who just have to have the latest gear at all times. For the majority of people, 802.11ac/wifi 5 is what their hardware supports, so that's what they need.