"The rest of the world is wrong, only I know the truth in this thread on a random web forum" is an unpersuasive frame to be arguing from. Corporate legal departments may be inflexible and hidebound, but they surely know this stuff better than you do.

No, this is the way it works. If you do what MS did and offer unrestricted perks to your temps, they'll sue you and you'll lose. Period.

What you're arguing amounts to "no one should hire temporary labor to work alongside salaried employees". And, OK, that's a position. But if that's what you want then you should make that case and not argue that somehow Viscaino doesn't exist, because it does.