You will still hit the same problems they described for some sites. Because some JS has been blocked by your blocker, certain websites will have buttons that just don't work. This is frustrating when those buttons are key things like 'buy' or 'confirm'.
I agree with the sentiment but it's not always possible.
In the case of airlines, sometimes you have no choice but to go with a particular carrier because there is no other carrier who will take you to your destination with seats available that meet your schedule.
You also wouldn't know of these practices until much after you have already paid for your ticket, by which time your booking is already in the hands of a few hundred other "trusted third party" employees.
