I use 11-40 2x GRX, no need for goats but always size the chain properly, so big to big plus one full link in this case, you're better off with a new chain on a new cassette anyway.
seen a few examples of people not changing the chain length
They've either done it too long for the smaller cassette or to short for the bigger one, the latter is worse. Limit screw doesn't damage anything, unless you spend all day turning it in and out.
I use 11-40 2x GRX, no need for goats but always size the chain properly, so big to big plus one full link in this case, you're better off with a new chain on a new cassette anyway.