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.
And the M1 Ultra even offers up to 128 GB RAM -- and that is also unified with GPU RAM.
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.