It's a common DoS vector. If you limit the allowed sizes, you can predict your min/max for compute, storage, cache, networking, etc. If you allow arbitrary resi

It's a common DoS vector. If you limit the allowed sizes, you can predict your min/max for compute, storage, cache, networking, etc. If you allow arbitrary resizing, the client can iterate indefinitely, doing things like "give me 1x1, now 1x2, now 2x2", which will tie up your compute resources, eat up storage, push legitimate data out of your cache, etc.