Not too surprising, why would Apple canabalize their product line by allowing more than 1 display on a consumer SOC? Most people who buy the M1 and now M2 machines are regular consumers that are not likely to use more than one external display. Apple considers support for more than one external display as a pro feature.
I would disagree. As argued above, many regular consumers now have two external monitors at home and at work. External monitors are cheap as chips, at least in 1920x1080 and 2560x1440 resolutions, and many many people are happy with those resolutions for day-to-day computing life. 6K is wonderful, but it's a very small share of the external monitor market. Even 4K isn't that big a slice of the total installed base of monitors on the planet.
FWIW, I think the issue is that the M2 is really the M1S, the same basic chip just hotted up a bit, and I suspect that basic M1/M2 design doesn't have the horses to drive two externals under demanding conditions. (Not that us MS Office warriors would want to drive it that hard, but if they make it an option, some users inevitably will decide to go hard-core on a computer that obviously wasn't meant for that, and will then complain that it doesn't work right for their heavy-duty needs. Le sigh.)
That was probably a deliberate choice they made to keep the base chip within the MBA thermal envelope, and we'll have to wait for the improved 3nm (or whatever) efficiency of the M3 - the first major redesign since the M1 - to get dual monitor support on the base chip.
I think my 2017 MBA is about to get an SSD upgrade to get me through the next 18 months until that happens.