Looking at an AC86U. Are there still issues with the 2.4Ghz band?

I was doing some research and was seeing a lot about issues with the 2.4ghz band not working after a while or having very short range (or poor performance) after a firmware update. Is this still the case? I have quite a few devices on this band.

BTW is this router generally still a good buy in 2020? I have no AX devices currently.

Thanks!