Static Pressure is the Source of All Evil? Or Snake Oil?

I just started a new residential HVAC Service Tech position with my second company after moving. They claim that almost every single maintenance problem can be traced back to static pressure. That there is a rated static pressure on the air handler datasheet, and if it's ever over that rating, you will have problems with pressure and cleanliness and wearing parts and drain clogs and tons and tons of issues. From the obvious blower motor, all the way down to the *condenser unit contactor*. Old systems running R-22 were built like tanks; they didn't need special care taken to the ductwork design because they were overbuilt as well as the fact their refrigerant was at a much lower pressure and wasn't as finicky, but modern systems including R-410A, and especially R-32, *must* have a static pressure in a goldilocks zone; not a single fraction of a decimal point over what's rated on the panel and above errrr-some lower bounding threshold they told me about that I've already forgotten...

The only times I was ever instructed to look at static pressure using my manometer in my previous company is when a relatively newly-installed blower motor breaks. Otherwise, we never even took measurements of static pressure.

I was a service tech for a couple years for only one other company. I learned 10% of my knowledge from a trade school for HVAC, 40% of my knowledge from my first HVAC company, another 40% from HVACR Videos (the channel) on YouTube, and 10% from various other google searches, YouTube binges, and places on the internet. Never have I ever even heard of static pressure affecting things like the drain line or bacteria growing inside the evaporator coil, and I'm almost certain that it doesn't change anything regarding the contactor... Is there *any* truth in this, or is this snake oil?

Some claims are:

  • Nearly every part failing before the 10-Year Warranty mark, especially within the first 3 years, is caused by static pressure.
  • Blower Motors pop early under high static pressure.
  • Blower Wheels get dirtier faster under high static pressure.
  • Evaporator coils are much more likely to leak under high static pressure.
  • Bacteria grows much, much faster under high static pressure.
  • Drain lines clog more frequently under high static pressure.
  • Evaporator coils get covered in slime frequently under high static pressure.
  • Dual Capacitors failing within the first 3 years is almost *always* because of high static pressure (this is Florida with high humidity and temperatures).
  • Compressors dying within 2-3 years after a compressor replacement is caused by high static pressure.
  • The most optimal solution to fixing static pressure is to replace all of the ductwork for 20k to 30k depending on the size of the house, and if the system is relatively new (even if they didn't install it for our client) they will "buy back" the system and give them a "free one" when they upgrade the ductwork.
  • Contactors pit and fail faster under high static pressure (he didn't say how exactly, but I extrapolate the reasoning being that since the system has to run longer, the contactor is pulled in for longer periods of time or something).
  • New R-410A and even R-32 systems can last 20 to 30 years so long as static pressure is addressed properly from the very beginning.