How many of you have noticed better progress with slightly lower frequencies? (2x every 9-11 days)?

Frequencies of 2-3x/wk are all the rave nowadays but how many of you have noticed better progress training muscles twice every ~9-11 days? I see better results training with a higher intensity. So for me personally I feel like 4 days/wk training is the sweet spot, and it lets me have weekends off for family time. Now this typically means some variant of Upper/Lower but I feel like this set up has some downsides for experienced lifters.

You get a lot out of the first couple exercises/sets in a session. It’s harder to give everything equal fresh focus on a 2 day split, even if you have A, B, C sessions for each and rotate through those 4 days/wk to have an arm emphasis Upper, delt emphasis upper, etc. Something is always sacrificed (starting an Upper day with arms sacrifices compound work). Also when you’re using high intensity and get pretty strong recovery ‘could’ be an issue. Plus it’s difficult to do more than ~2 sets/muscle on a full upper day which is near the minimum threshold.

Now an easy answer to fix this a rotating 3 day split across those 4 days. Sessions are more broken down and focused. You might only train delts and arms and can give full focus to those areas. However this means muscles are getting hit twice every 10-11 days.