I love this question and I have to admit I am getting to be an old fart and have been skiing almost all my life. My answer is 20 years ago people did have quivers, but most did not, and there weren't as many ski options back then. I have been an expert skier most of my life and I skied every possible place and condition on slalom racing skis. They were simply the best performing skis you could buy and if you could handle them reasonably long (205 cm) were a pretty good all around ski. Twenty years ago I always wanted a second pair of powder skis, but since I lived in New England, I lived without them. I never liked GS style skis, and there wasn't much else to consider. We New England skiers all have "rock" skis, not sure if that counts as a quiver.
Now, my god, the choices are almost endless. The industry is devoted to developing the next "hot" thing so it can hype it and convince you it will turn you into the next olympic medalist. I am an engineer and I do agree that skis have gotten much better these days (I bought a pair of Spalding skis a long time ago, actually two pairs (I guess I did have a quiver) because they were only $25 brand new. The first pair started to delaminate on the 3rd run and I couldn't finish out the day (a chunk of the ski flew off and almost hit another skier and I figured I was a danger on the slopes). The second pair made it through the first day and survived the season with lots of epoxy repair work. And skis have also gotten very specialized and are great at specific conditions and horrible at others. Hence, you want multiple skis to have the "ideal" ski for the conditions.
Everybody is different, but you really have to research and dig to find a ski today that is a "generalist" or good at most conditions. I guess they call those "1 ski quiver" skis and they never seem as appealing as that "awsome" mega wide ski that rocks in the powder.
As an old fart and and expert skier, I still compare a new potential ski purchase to my 205 slalom racing skis, which I still have and use (they have become my rock skis). I haven't found too many modern skis I like as well, but I am just getting into the new ski search after ignoring the market for 10 years. I have found lots of skis that are much better than my slaloms in certain conditions, but few that are as good across the board.
I bought a pair of Ullr's Chariots this year and I have to say they ski a lot like my slalom racing skis, only better. I am really happy with my choice. I can't believe a 101mm wide ski feels so good, but they do, and they are supposedly the ultimate "one ski quiver" ski. So now I need a skinny racing ski and a really wide soft powder ski and I'll be............................ seriously in need of therapy!!