Let me start by saying that I never tracked my TSS. I found out early on, I needed to eat more in general, but especially on the bike. Once I did this, I was a much happier camper. Getting proper sleep is of course HUGE as well.
I did the high volume full distance base, build, specialty plans last year. I ran 5-6 days a week w/one tempo (warmup, 10km tempo, cool down) and one long run (usually easy, sometimes build into tempo). Did I ever feel tired? Yes. I would then skip a run, typically an easy run on Fri or Sat. Could I have added more intensity? Even if I wanted to, I could not have added more intensity w/out running myself into the ground or worse getting injured. Maybe instead of a tempo run I could have done some intervals. On the bike, I think the plans provided all the intensity I needed or wanted.
The short version: While TSS can be useful, TSS is not the be all end all metric. Chasing TSS is a mistake.
There are more blog articles and podcasts related to TSS if you search. Here are a few: