Is TSS of Sub-threshold Zones/Levels Created Equal?

See my post/answer above. I very much get the TTE concept. I’ve been taking a “fatigue resistant”-centered approach to training lately, stolen directly from that video. I progress tempo, SS, and threshold intervals out as far as possible (until FTP changes of course, then i reset)

Almost exactly like this.

And as such, seems like TSS could be a very valuable tool for me. When you stick to sub-threshold work (for the most part), seems like it is created equal (and therefore useful). @Tanner1280 thoughts seem to suggest this as well.