The once problematic ralink for 9.2/9.3 now works flawlessly on NetBSD 10 Beta:
un0 at uhub2 port 4
[ 786.435833] run0: Ralink (0x148f) 802.11 n WLAN (0x5370), rev 2.00/1.01, addr 3
[ 786.505833] run0: MAC/BBP RT5390 (rev 0x0502), RF RT5370 (MIMO 1T1R), address 2c:73:60:06:c5:40
run0: flags=0x8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
ssid TP-LINK-2022 nwkey *****
powersave off
bssid 98:48:27:cd:3c:ba chan 1
address: 2c:73:60:06:c5:40
media: IEEE802.11 autoselect (OFDM54 mode 11g)
status: active
inet6 fe80::2e73:60ff:fe06:c540%run0/64 flags 0 scopeid 0x4
inet 192.168.1.103/24 broadcast 192.168.1.255 flags 0
Million thanks !