Bevo, in your example above, the 0.1m2 stealth aircraft (with external stores) is still much more stealthy than a 10m2 Sukhoi with external stores, by 2 OOM in fact. I really do appreciate the non-additive, non-linear relationship of such things. On balance, external stores will affect a stealth platform in a much more severe way than a non-stealth platform. The former are optimised against LO requirements, whereas the latter are either blissfully inconsiderate of it or treated to make a design as good as one can.
Thankfully, aerodynamic shaping on weapons fortuitously means that Rayleigh scattering/specular reflection prevents ~14000m2 being seen at the radar in reality; well, at the more offensive aspects anyway.
A stealth aircraft with external stores is still more stealthy than a non-stealth aircraft with external stores. It isn't as doom and gloom as some people like to make out. Of course, if I were LockMart I'd be developing pylons and weapons that were optimised to the F-35 and not just bolt-on bits of orthogonal metal.