From an overall fatigue standpoint, I haven't found usrpt style swimming to be difficult to manage. It hasnt ever impacted my ability to bike or run even later the same day. It's quite typical for me to do usrpt 30x100s in the morning and then do a long run, or 4x mile repeats run, or 5x5 style vo2 bike session later in the day. That's my normal Thursday.

Those run or bike sessions are never compromised by the swim earlier in the day. However, the reverse order will seriously compromise my swimming. I need to leave 24-36 hrs between a hard/long run/bike session and the next usrpt swim.

So, yes I totally agree that you need to manage run/bike stress to leave yourself fresh enough to swim well. But, the total fatigue of the usrpt sets isn't a big deal to recover from and manage through the week.

ETA: What I think killed my swim over the last 6 weeks was doing all the doubles, as well as taking NO days off. My reaction to a poor swim set was to back off on the swimming... Maybe cut the set short... Then skip the next recovery swim day hoping to recover for the following usrpt set. So, swim volume suffered, and I started missing quality sessions too (or cutting them short). I swam 40kyds in January and, was on pace for closer to 50kyds before it started going to shit. But, I only managed 25kyds in Feb. My usrpt paces have fallen off almost linearly with my drop in average volume.