yes I believe so, but I also believe the best standard is the one that works the best for the situation, and your situation may differ (in fact, it should, thats kind of the point)…
for me, for cx/bikepacking/touring/booze-cruising/whatever bikes, they tend to stick around for a while and tend to iterate through a few builds/styles over time,( including after I replace them), so having the option to simply bolt on an adaptor to fit any brake calliper is a real win. I also build them 135X10 QR rear end, because i’m yet to see a good reason not to; it makes the fabrication and use of the dropouts and the mounts super easy forever, and its a vibe I like, (don’t forget we’re talking about custom bikes here).
sure, I might put mechanical sram red 10s with post mount road pull bb7’s on my new bike, because i’m a curmudgeon, but the next person that wants to ride it probably doesn’t want that, maybe they want the WZRD Shimano road lever, xt calliper special, or maybe they want a flat mount hydro red group with batteries. maybe they want to put 180’s on it, maybe 200’s?. they might want a flat bar and a rack or an ENO hub fixie, maybe ill want that? the ISO tab doesn’t care, and for this situation, I think thats ideal (ok the Eno hub maybe a bit of pfaff but you know what I mean) .
also, threads in replaceable parts is generally good practice, so i like that too (especially for how we treat CX race bikes) ; its pretty hard to wear out or strip an ISO tab hole…
from a pragmatic standpoint I don’t really see a great reason for me to not use a single piece dropout ( for example, like the paragon low mount offering ) in a bike like this, self fixturing per-se, as mentioned above (or just integrated into the dropout and cut as one part) , and minimum fabrication time, puts the brake inside the rear triangle where I like it, and so on and so forth, but I wouldn’t say there’s anything inherently wrong with using a multi-part design, provided its well though out, and well executed.
