jki275 parent
64gb is fine.
This subthread is about the Macbook Air, which tops out at 32 GB, and can't be upgraded further.
While browsing the Apple website, it looks like the cheapest Macbook with 64 GB of RAM is the Macbook Pro M4 Max with 40-core GPU, which starts at $3,899, a.k.a. more than five times more expensive than the price quoted above.
I have an M1 Max w/ 64gb that cost me much less than that -- you don't have to buy the latest model brand new.
if you are going for 64GB, you need at least a Max CPU or you will be bandwidth/GPU limited.