There is a well-documented limitation within the early M-series chips which prevents scaling. This would most affect Mac Studio and Mac Pro. These issues are addressed in the M4 chip design. It makes sense for Apple to have skipped the M3 entirely while focusing on the latest architecture.It is absolutely ridiculous that there will be M4 Max MBPs while the Studio and Pro are still on M2.
The higher-end M3 Max already had nearly the same performance as the M2 Ultra in some areas, the M4 Max is likely to beat it out across the board.