So in the start in the switch to vendor supplied drivers vlan tagging did not work with new CapsMAN. So you could not enable vlan filtering on the bridge because then it did not work. For example dynamic interfaces did not get the assigned vlan in the bridge config.
This was corrected in, I think, 7.8 or 7.9 and now vlan filtering on the bridge works.
This was never a wifi-qcom vs wifi-qcom-ac issue but a new CapsMAN, under then, wireless wave2 package.
So now recommendations are the same as far as I understand.
only difference now is that ac version driver do not assign vlan still to the interfaces on bridge.
Where did you find recommendations to have them different?
Edit: I found the config example and you are correct. Ax driver do not have vlan filter on but ac does.
https://help.mikrotik.com/docs/display/ ... ionexample:
I think MT have not updated the code examples after v7.9 as in this version this was fixed.
Changelog entry from 7.9
*) wifiwave2 - automatically add a VLAN-tagged interface to the appropriate bridge VLAN;
I run a few cAP AX and they all have vlan filtering turned on now since 7.9.