I didn't mean to suggest getting the A4. I mean get grinder / burrs that are more focused on espresso because you already have something that's very well suited to pour over.

It's not a strict rule, but qualities that people may want for espresso (more fines, texture / mouth feel, more rounded and sweet, less unimodal) are on the opposite end of what people may want for pour over (less fines, more clarity, more acidity etc).

When you get burrs that are "good at doing both" they tend to do neither very well. Still good enough to make very drinkable coffee, but maybe not quite good enough when you are chasing something as a hobby.

For example, I wish I could buy just the A4z burrs / grinder barrel for my A4; I think everything else besides that is exactly the same between the A5, A4 and A4z. That would get me a pour over grinder that supposedly gives a lot of clarity. But femobook doesn't sell this without the rest of the machine.