Franco, I meant that I actually thought it was funny. No arguments whatsoever about using them. Just that you do have an affinity for them, and the assumption is that you probably would use one... and the thought of trying to split the weight of something that, um, can't be split is, well, funny!
I don't think it's a matter of people never setting up in the rain. It's just that people are used to doing things different ways, and are accustomed to the pitfalls and benefits of the system they've used. Here in the US it seems to be quite popular to set up the inner without the tent in fair weather, gaining well-ventilated bug protection. Not saying it's my way, but common. If I'm expecting truly horrid weather I have a "true" double-skin, nylon-walled inner, and the less than a minute it takes to get a fly over the tent doesn't make a big difference in whether the interior gets drenched.
Rain has nothing to do with waiting for a partner to arrive... unless, of course, you're hiking as individuals. If you do, that's fine, and solo gear might make sense. Or, I guess we could say that if the slow person had the whole tent, the faster person could be just sitting there in the rain anyway. Personally, if I do choose to hike with someone, then I pace myself to actually hike with them. If I want to hike by myself and at my own pace, I'll do a solo hike.