I am a big believer that it should depend on your region and the styles of courses you are expecting to race. Out west, there will be more sustained climbing than you have in other regions. The power demands of say the national champ course and Beaver creek are very different than what you could expect for some of the other XPS races. I chose short power build and modified it to fit my schedule. I only did the 2 weekday interval sessions and towards the end of build, one of those started to suffer as the running intervals got harder/more duration.
You’ve got to look at it as a triathlete and not just as a cyclist. So sometimes you just won’t be able to do the full workouts as prescribed, but you should always try your best and if things start spiraling downwards, pack it in and save it for your next workout. I did not do well with the 3 min intervals in the 2nd half of the build, but those are also a part of general build. I surprisingly did make my power targets for the shorter intervals the day after my long run.
Reading through the pro thread posted by sryke the other week gave me confidence to not sweat making every interval of every workout. Look at the overall trends and realize that there is a reason why a triathlete isn’t as good at a single sport as a swimmer/biker/runner and come in with the mentality that doing all three is the sport and that having good fitness in all three is the goal without over committing to one or the other.