Bunky
Detailing Gnosis
Just because something is offered in bulk/large sizes (55 gallons), it shouldn't automatically discredit a product or company. However, as you mentioned, many of these companies that specialize in these large quantities haven't updated their product line in many years/decades. In fact most aren't in tune with modern detailing technology that has evolved in the last 10+ years. Most importantly polishing compounds, cleaners & protectants.
I was sure this was the intent of your post in regards to bulk products having a negative connotations. I suspect many continue to use the same formulas because they are very cheap to produce since newer technologies usually cost more despite being more effective and could save time. They may use the better stuff when the cheap stuff does not work. In production detailing, are the benefits of better even appreciated unless it reduces the cost to the bottom line?