Well if its so frustrating, then they'll just leave the rt alone, and the alien team will have a slight advantage because of it.
Dont see much differense between my idea and recapturing. Yes it will require more work to go with welder than without, later that welder could be used on marines, most comms never give out any until mid game. In the latest ns1 they added map indication of rt's under attack, why even bother with saving an rt if its frustrating, some teams dont do it, they get a disadvantage.
Personally i try to def rt's as much as possible (if im close), and if i have a welder i weld them, called teamwork, but true, few bother with it. So my idea gives a reason to bother...
Say we skip the rt penalty. I still strongly think the other base buildings should, for the sake of realism, have function penalties when damaged. Examples:
obs could have: reduced radius, delay on decloak, less updates per second when tracking units
ip: longer time
armory (little harder): longer for ammo/heal, less ammo/heal, delay on wep spawn
Basically take what the building does, and reduce that.
This is the kind of thing that should get playtested to see how it works out.
And give some opinions on the other suggestions in this topic. Instead of only the rt one by me. While you're at it, give more thorough responses. Try helping make an idea work instead of posting "one-liners" where "your highness approves or disapproves"

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(im not being an aggressive forum kiddie or any cr*p like that, just writing down my thoughts as they come to me)
/w