I totally agree. I now own a 50 and 100 watt amp and both sound excellent with just their own master volumes turned down. Tried both with an attenuator and didn't feel there was an improvement in tone, quite the contrary.My $.02 with a search for a bedroom amp would be this: even at "bedroom" levels, a low wattage amp is going to be really loud. As well, I've never heard an attenuator that didn't squash the tone as well, so I'd either look for an amp with power scaling that lets you get really low (Carr Mercury, Fargen MiniPlex) or look for an amp with a great master volume control that'll still sound good even on 1. Good luck!
To me many of the low watters have a kind of scratchy, slightly thin quality to them when overdriven. Not a fan of that. The SimpleX clip is a good example.