Is it sufficient to only consider kinetic energies of molecules for pressure?

Question

So in this answer I learned one can derive pressure simply as a proportionality constant by only considering the kinetic energy terms. However, in this answer I learned one cannot get the pressure we know and love by only considering the kinetic energy terms.

How can both answers be correct? (What am I missing)? Is it sufficient to only consider kinetic energies of molecules for pressure?