as of linux 4.12, we'd put in some major enhancements to linux wifi, originally for the ath9k chip, nowadays the ath10k, most of mediatek's mt76 line, and most of intel's chipsets, making fq_codel run native (near zero cpu cost), and solving the packet aggregation and airtime fairness problems thoroughly. The relevant paper and test suite is here: https://www.cs.kau.se/tohojo/airtime-fairness/ - 2.5 the capacity at 1/10th the latency on some tests.
My question is - does mikrotik use the factory wifi driver, still? Are there options for ATF, now, at least?
A dream for me, has been for more folk to understand how important getting packet aggregation and ATF were to scaling 802.11ac and later for multiple stations. In 8 minutes, here, I'd explained what everyone had been getting wrong with wifi: https://www.youtube.com/watch?v=Rb-UnHDw02o&t=1558s