I must admit I used, overused, and abused my old solo tent. About 35 years ago, well before the days of silicone nylon, I found a 100% nylon pup tent that said 2 people. I think by todays standards it would be a 1+. It weighed about 2-1/2#. I used it for about 10 years. I really loved it. A really terrible price we could barely justify, $29. 3 or 4 years later we got another somewhat cheaper built model, though no less expensive. After 3 nights of rain on the Ausable, on a flyfishing trip, we discovered a couple leaks. We added a nylon tarp to both. Later, after the color had washed out of the orange nylon, and turning it to a strange pale yellow, I loaned it to somone and never got it back.
Why did I choose it? Many reasons.
1) It provided good weather protection, never perfect.
2) It was big enough to cram 2 people in, if you really liked your partner.
3) It was small enough to bring two, in place of one 10# beast.
4) It had a FLOOR, a novel concept for a backpacker that had never seen one in a back woods tent.
5) It looked strange on a state campsite, a lonley tiny pup tent?? Sears 10 and 14 man tents surrounded me, reminding me of my place in the scheme of things. But, it did provide privacy. With a 3 pound tarp, a good campsite with all the basics.
6) 6 stakes to set up. Simplicity. I could walk in, have it out and set up, before my partners would even finish getting poles together for their fancy new free standing tents.
7) For ten years, it was the lightest thing for shelter I could find. (BW, ie Before Web.)
8) It was bug proof. On spring fishing trips, ice-out, it worked excelently to repel the swarms of black flies that often surrounded me. A NICE safe zone.
9) I used it as an ice fishing shelter, with a full plastic covering, cept over the vent. My brother and I would sit and play cards for hours, it seemed. The tent was just nice to be in. 'Specially after I got the old SVEA...it was even warm at -10F.
10) It was really durable. 10 years out of a tent was good service.
11) The wife and I used that old solo tent together a lot. Our yearly week (well, 9 days) long trips in fall became an anual event...we still practice that.
12) I was just comfortable using it. Crawling in, sitting up to tie off the storm flap (if needed) & zipping up the screens, laying down and maneuvering into the bag was just easy and comfortable. Only a side entry is as easy. On a couple occasions I had a bear (probably a 'coon) snuffling around outside the tent. That was OK...I was in the tent. Mostly, I don't even wake up anymore because of critters... Using a tarp, once the kids had grown and moved out, was in many ways, almost the same as using that old solo tent. I believe it measured about 38" wide(I think, it didn't *quite* fit two old military winter pads, I needed to cut them down) by about 7'3 long and 40" or 42" high. About 8" around and 15" long, including a 7'x7' tarp, good for a carry package.
When it came time to replace it all I could find were blue, with heavy, woven poly floors. I could never find the like, though I found a picture of one in an old magazine around 1976 or so. I sorta wish I could copy that tent design in silnylon, or cuben, today.
So yes, I was just getting to it, it was not about any of the things you mention, alone. Rather it was about ALL of the things you mention, and more.