who says i need molo and at nades? and at guns can easily deal with any p4
If you start with T1, you need AT nades or you'll be obliterated by AC if you want to play without guards.
If you start with T2, you need molos for clearing buildings as you obviously won't have flamer M3.
And no, AT guns can't easily deal with P4s, not without numbers, not without AT nades snaring them for their 50% longer then PaK reload to give effect and without guards to hold it in place.
Its not even theorycrafting here, its plain logic if you have any idea on how sov units work(which in your case might be a questionable ability).