I'm going to take some exception to your premise. I did choose a solo tent for nterior living space, privacy, views, and bugs. But the trump card was weight.
Now, to be fair, I don't exactly have the lightest Tarp/Bivy/groundcloth system - ID Siltarp, Titanium Goat Ptarmigan bivy w/ full net bug hood and a Tyvek groundcloth. But when I added it all up, I found the LightHeart Gear Solo was lighter. It's capable of outstanding, bug-free views, it's roomy, and it provides privacy.
"How do you feel about owning, carrying, and using a solo tent when you might know that *something else" might give you *something more* for less weight and cost?"
Not sure what you mean by *something more*. If you're referring to a tarp/bivy combo, I don't know how that gives one "something more" for less weight or cost. I got all the attributes you mentioned for less weight than a comparable silnylon system for $199. If I wanted less weight, I could plunk down considerably more for a cuben tent, or I could give up all those attributes and leave my bivy and groundsheet home.
The Tarp/Bivy combo does offer a bit of flexibility. I'm heading out for an AT thru attempt next spring. I considered the tarp/bivy for the flexibility of using the bivy in shelters, and the tarp/bivy when stealth camping. But I would much rather stealth camp than stay in vermin-infested shelters whereever regulations allow And I do like the wx protection, privacy, and the protection from bugs the tent provides.
The fact that I saved a few ounces was the deal clincher.