Wait - what? "not even selecting for yeast that finish out"?
In a starter?
I mean, low octane, highly oxygenated, warmer than any sane person would run an actual batch?
Aaaanyway....
Step back from the ledge and consider this: do you think any yeast propagation company uses recognizable recipes to crank out metric crap tons of yeast?
Cheers! (you know the answer to that

)
[edit] Let me turn the table around: you've harvested some 1318 yeast from an ESB - or better yet, from an NEIPA you bio-hopped the daylights out of

.
A month down the road you want to use that strain on a sweet stout. Is it the same as what you poured out of the package, or was it somehow "changed" along the way? Are you going to ranch two branches of the same strain?
Sorry, bit lost on the first bit, trippr. What I mean to say, is that the conditions in a prop., and the harvest of the yeast from that prop., are different from those in a brewery fermentation - at least typically, in my experience (e.g., just one - but if your last step in a prop. is x 10, and your brewery step is x 4, that alone is different). And it probably grows wearisome to hear, but I'm going on memory - but first generation yeasts are whacky. Things don't hit their stride till a few in - because by growing, fermenting and finishing out in the conditions you're maintaining for your given beer, over time you're automatically selecting for optimization, in that environment.
So while yeast propagation companies don't go through brewery ferments to manufacture, neither are breweries pitching with fresh, 1st generation, propagation company yeast (not ones I know, anyway). I know at Goose Island, I think we'd go up to as many as 20 generations or until weird signs started to show. Again, memory, which is faulty.
From my cheesemaking days, it's the same thing - buying cultures to pitch and wash rinds, yields an extraordinarily different cheese from those made down the road, using whey and rind morge cultures harvested from the ambient conditions of my vat and aging cave. In fact, in traditional alpine cheesemaking, your first couple uses of a given seed culture are not used for your main cheeses --too expensive. You "warm up" the cultures by getting them going in the environment they're going to be doing, as production cheeses, by doing quicker turnaround, "lesser" cheeses in similar (though not exact) circumstances. (E.g., raclette or reblochon, for a Beaufort main cheese).
It's the same with sourdough, though it's less critical, vastly so, imo. But there's no denying a difference between an "old" starter maintained by recharging v. a brand new sour culture.
Not sure if I'm being clear in what I'm trying to get across, but that's my experience, anyway.
Edit" Sorry, just saw your edit. No, I wouldn't maintain 10 strains for 10 beers in a lineup. But I also wouldn't buy afresh each time I wanted to brew. I'd argue the difference between first generation and 5th generation yeast, is likely going to be greater than that between the same yeast of equal generation, in different brews. That's my main point and again, this is just memory. I'm certainly interested in hearing more about this.