Absolutely true.
If it hid a large dust particle, can you just imagine how much resolution would be lost. But the internet myth goes on and on and on , and just like the dictators propaganda, people believe it.
The other is stand developing. It makes streaks ( bromide drag ) that may or may not show. Certainly they will appear on the very best frame you ever shoot.
How about Rodinal being sharp. NOT. D76 1:3 is sharp, ugly but sharp. Time is around 16/18 min at 68 deg. Detail like you would not believe.
How about pushing film. You might get a little more shadow with certain developers, but not a whole lot. Diafine will get 1200 with Tri x, but image is ugly. Extending time in D76 is a waste.
Mixing ISO on the same roll. No. All you get is some over and some under exposed frames.
How about my fiber prints dry flat on a screen.. Get real. Only two kinds of dryers work. Those that interleave prints with blotters and corrugated boards and have a fan blow, and those that tape a print to a drawing board or glass plate, ferrotyping, or the big 36" drum dryers,
Those that say they can weight a cockled print flat under weight. No. It is cockled because the edges are longer that the center in dried state. Unless you have a paper stretcher, there is no way to fix or you have a poor definition of flat. The metal industry gets wavy edges from rolling and they use stretchers to fix. I used to be a roller. A rolling mill needs parallel rolls to roll flat. Control with jacks on ends and differential cooling . There is art to it. It is really an extrusion process.
The only thing I will concede is I have prize neg that got a scratch where the roll end flipped up. A condenser clearly shows the line. A diffuser does not. Leica V35 and Focomat IC, latest Leica lenses on both. But hide dust no way. and the line shows as white and way to fine to spot. Finer than if you lost a hair on the paper under the enlarger.