Not true. Depending upon the processor choice, M1, M1 pro, or M1 max, you get 1, 2, or 4 external monitors. Up to 64 GB ram. Do you really need more than 64 GB? The number of users who actually need more are a very small part of the market.
The price of RAM is absolutely bonkers though. If i ever need more than 16GB of RAM and more than 512GB of storage, I'll strongly consider moving back to Thinkpads or something.
And the M1 Ultra even offers up to 128 GB RAM -- and that is also unified with GPU RAM.