I can fully grasp your thinking here. However, that person buying Mac Studio M2 MAX can't buy a Mac Studio M3 MAX yet. That's probably not hitting until Spring 2024 at the earliest... and may not hit until sometime after that. It is likely to WAIT for M3 Ultra which may or may not be ready for Spring 2024 shipments.
Else, if we're going to fault the timing of an upgraded laptop vs. a desktop, consider the timing of when someone could buy a M2 MAX MBpro vs. buying a M3 MAX MBpro (which- per the presentation- is delayed from delivery for a few more weeks vs. M3 PRO and M3). For them, it will be nearly 11 months as "king of the mountain."
Further, many argue that M2 MAX MBpro was delayed from plan, supposedly supposed to be launched last Fall. If we can buy that as plausible, it would have been over a year between updates for same model Mac if it had launched on time.
The big winners by far in this timing concern is the people who jumped on M1 Macs right out of the gate. M2 was delayed so they had "latest & greatest" for an extended period of time that may never be repeated. Some even argue that M-silicon, being based on A-silicon, is likely to get on the same annual update cadence as iPhone... even if Macs sell in much lower volume than the cash cow.
Bottom line: buy ANY tech now and an update is on the way. Time with "latest & greatest" is fleeting. One reason to follow rumors is to try to get insights when new "latest" is going to hit. If maximizing time with "latest" is paramount, do not buy one day later than launch day. Any mid-cycle purchases are doomed to lose "latest" status much sooner than those who pay maximum price at launch.
Some good number of people purchased M2 Macs on the day before M3 Macs were announced. And since those are not yet shipping, some number of people are buying M2 Macs today, tomorrow, and into Nov 7 before M3 replacements are actually available for purchase in stores. Some quantity of people are going to walk out of Apple stores today with a M1 iMac or M2 MBpros and not have a clue or thought about the SOC inside. To them, it is their "brand new" Mac.