Having read/tweaked so many settings, these are as good reasons as anything else.
@merkkg, it’s pretty much ROS default. Here are the changed parts, where 5 GHz and 2 GHz are configured with the same SSID and security.
# 2025-02-28 18:37:26 by RouterOS 7.18
# software id = Q07T-KVUZ
#
# model = C53UiG+5HPaxD2HPaxD
# serial number = <>
/interface bridge
add admin-mac=<> auto-mac=no comment=defconf name=bridge
/interface wifi
set [ find default-name=wifi1 ] channel.band=5ghz-ax .skip-dfs-channels= 10min-cac .width=20/40/80mhz configuration.country=Australia .mode=ap .ssid=<> disabled=no security.authentication-types= wpa2-psk,wpa3-psk .ft=yes .ft-over-ds=yes
set [ find default-name=wifi2 ] channel.band=2ghz-ax .skip-dfs-channels= 10min-cac .width=20mhz configuration.country=Australia .mode=ap .ssid= <> disabled=no security.authentication-types=wpa2-psk,wpa3-psk .ft= yes .ft-over-ds=yes
/interface list
add comment=defconf name=WAN
add comment=defconf name=LAN
/ip pool
add name=dhcp ranges=192.168.150.10-192.168.150.199
/ip dhcp-server
add address-pool=dhcp interface=bridge name=defconf
/interface bridge port
add bridge=bridge comment=defconf interface=ether2
add bridge=bridge comment=defconf interface=ether3
add bridge=bridge comment=defconf interface=ether4
add bridge=bridge comment=defconf interface=ether5
add bridge=bridge comment=defconf interface=wifi1
add bridge=bridge comment=defconf interface=wifi2
/ip neighbor discovery-settings
set discover-interface-list=LAN
/interface list member
add comment=defconf interface=bridge list=LAN
add comment=defconf interface=ether1 list=WAN
/ip address
add address=192.168.150.1/24 comment=defconf interface=bridge network= 192.168.150.0
/ip dhcp-client
add comment=defconf interface=ether1
/ip dhcp-server network
add address=192.168.150.0/24 comment=defconf dns-server=192.168.150.1 gateway=192.168.150.1 netmask=24/ip dns static
add address=192.168.150.1 comment=defconf name=router.lan type=A
/system clock
set time-zone-name=Australia/Sydney
/system identity
set name=ax3.5
Speed checks are instantaneous so one check will often differ from another depending on what is happening elsewhere. I am observing Tx by Option-WiFi on a Mac. I rarely see below 800, typically 870-960 in the room I mentioned earlier with 1020 occasional. The house is about 19M long, three levels via splits, the ax3 sits 2M up on top of a bookshelf in a top room just front of centre. I have found previously that height really helps for less-obstructed signal. Reception is fine but not terrific on the floor immediately below but that is inconsequential as most stuff there is cabled or on different nets. The mid-level floor behind gets good signal from the ax3 but that is also where I have the ax2
As you can see this device is a DHCP client. After some other changes upstream I plan to modify it to be a bridged AP, not routed, when my network trunk will be 2.5Gb.