Yes but if I remember correctly it was planned by satoshi to monitor the amount of transactions and then adjust the block size if it seems the mempool is to crowded. Not as a one time thing but maybe every few month or years. But I will research his posts to this.
But the mempool isn't too crowded. Yes, there are times when it fills up, but even then "high priority" fees only go up to a few dozen sats/vbyte which is hardly unreasonable, and it rapidly clears out again.
Here is a visual representation of the mempool over the last year:
https://jochen-hoenicke.de/queue/#BTC%20(default%20mempool),1y,weight.
The vast majority of the time the mempool is not overly full, and even a fee of 1 sat/vbyte will confirm within a couple of blocks. If we reach the stage where the mempool permanently has a large backlog of transactions, and nothing below 20 sats/vbyte ever confirms before being dropped, then sure, there might be an argument for further increasing the block size. But at the moment that is far from the case.