Time Under Tension in itself is not a stimulus for growth, it's only a qualitative measure of the set. The thing that matters is the fatigue created, of which TUT is AT BEST an indirect and approximative measure of.
And even if it was a direct stimulus for growth, you would not be able to maximize all stimuli at the same time. For example load and TUT are pretty much inversely related: the higher the load, the lower the TUT. So you can't have maximal tension when TUT is high.
As such there is no need top try to maximize every possible way to stimulate growth on every exercise/set you do. Front squats are an exercise where it is best to use heavier weights and slightly lower reps, period.
I believe that TUT is a gimmick coined to pass another gimmick as "fact": training tempo. I believe that precise tempo prediction is something used mostly by coaches who want to look more important than they really are.
YES how you perform a rep matters, but you don't need precise speed formula for this. I prefer to give qualitative recommendations. For example I prefer to tell someone to lower slowly while flexing the muscle. This will accomplish more than saying using a 5010 tempo because even if the person goes slowly, it doesn't mean that he/she will flex hard (he likely wont, to save energy).
Another issue with tempo is that most coaches do not thing when they write down tempo prescriptions. In their mind 5020 is slow, 3010 is normal and 1010 is fast (for example). Well 3010 might be slow on some exercises (wrist curls, calves, shrugs) and fairly fast on others (squats, front squats). 5020 might be slow on squats but it is suuuuuuuuper slow on some exercises. 1010 (a TRUE 1 second count) can be fast on some exercises but normal on others. Most coaches do not take that into consideration when writing down tempos.
In all honesty I do not know of ANY accomplished bodybuilder, powerlifter, strongman, olympic lifter, etc. who use tempo prescriptions.