You could easily interpret that as -

Perfect _implies_ that it's easy to write and understand, but it's not the whole picture. It's just a feature that _he_ thinks is _crucial_ to it being perfect.

You get my point right?

Like sure, you could implemented a _perfect_, I don't know like gnome desktop in assembly language, but it wouldn't be easy to write and understand.

He thinks it's essential that it should be easy to read and write for it to be perfect.

Unfortunately, He's not with us now so can't even confirm :(