At the risk of saying the same thing for the third time (on one thread!), it’s not about how to interpret octave clefs when they’re used, it’s about how to handle instruments that should always sound an octave out regardless of whether octave-transposing clefs are used or not.
I can’t think of many symphonic works that don’t use at least one of the following instruments:
Piccolo
Glockenspiel
Xylophone
Celeste
Double Bass.
All of these instruments sound an octave (or two octaves) away from where they’re notated, always. It doesn’t matter whether you use an ottava clef or not. The player will always assume that that clef is intended.
The tenor voice is notated with a treble clef, with or without an “8”, but whether the “8” is present or not, tenors will always sing an octave down. This causes problems in Dorico with the new Condensing feature, but that’s another story for another day.
“Fix” the problem for the (presumably) smaller group of people that want to use octave clefs as though they were octave lines, and you create a new problem for the (presumably) larger group of people that write for Piccolo, any number of pitched percussion instruments, double bass, guitar, bass guitar.