Sigh. This is either pure laziness, pure greed, or both. Macbooks have been capable of displaying / switching between multiple windows on multiple monitors for years, with less than 4 GB and far less CPU / GPU power than one tenth of the A12Z. Either the engineers were instructed, "Implement this as inefficiently and resource-intensively as possible", or else it was simply a sales decision (let's force 'em to upgrade).
Either way, the harsh truth remains: nothing that iPadOS is capable of requires anything approaching M1; the software is outclassed by the hardware and M2 will just make it worse.