Surely these aspects would be much less relevant back then when professional repair was mainstream and vacuum tubes could be found anywhere, but you can't deny they will save you from big headaches especially in today's day and age. Also, the videos give the opposite impression of a "production line repair" - they are quite detailed and caring instead, thus the five seconds per tube removed is rarely an impediment.
I did a few non-professional repairs back in the 1980s and, apart from the manuals I had read, these were also rules backed by the experience of some of the TV technicians I knew and read about at the time - some of the vacuum tubes were already expensive back then (not the PL36s and PY88s, but especially the big PL509s or PY500s of the big 26'' TVs) and minimizing these risks was already wise.
Overall, as I said before, the videos are entertaining and useful and nobody (including me) is perfect but we all have to be open-minded to improve, even if we have been doing this for 40, 50 years.