You should be a little clearer on what hardware you are using to test. Does the desktop/ laptop have an ax211 or ax411? What android phone are you using? Also a little skeptical on your 6GHz results.
Results are irrelevant regardless.
I've had notable "high end" routers in my home that perform worse than lower end configs with similar 4x4 radios when testing with the same clients/channels(unii1+3 + DFS)/settings.
Some routers just perform better in different home layouts, WIFI congestion, etc..
Any WIFI test should be taken with a grain of salt. It's very misleading in terms of what "works better".
Yes there is Merritt to higher MIMO configs performing better, but the top end 4x4 radio options are kinda RNG per environment (8x8 exist, but limited to a specific buggy QCA platform).
I've tested too way too many routers subjectively as a hobby lol