The 4.4.0 firmware is out and the high CPU bug I had with the RC is still not fixed. If I turn on WiFi, any LAN traffic causes a maxed out CPU and seriously reduced bandwidth i.e. ~80Mbps on BT FF 900.

There isn't any Mesh support for the ax model either. There are significant bug fixes - they have fixed the crash I was having with wireless - and a bunch of new features in this one: https://www.draytek.com.tw/ftp/Vigor2927/Firmware/v4.4.0/DrayTek_Vigor2927_V4.4.0_release-note.pdf