I suppose if someone is gluing wood on YouTube they know best practice so their results shouldn't be surprising.
That's pretty funny given what gets posted on YT.
Several old sayings come to mind: "Made in a factory must be right." "Been doing it this way for years" "That's how I was taught."
If anyone still has an interest, here are some of my experiences, relating to the above old sayings.
A professor teaching woodworking to future school teachers produced a very expensive desk. Beautiful wood, very nice appearance when first displayed at a major art gallery. When I saw it, I couldn't believe that someone that knew what they were doing, would do what I saw. The gallery bought it for it's permanent collection. Ideal storage conditions. I asked to see it several years latter. I knew one of the gallery employees. We went down into the storage vaults and found it. It was a disaster, full of cracks and failed joints. Why? because the maker didn't understand his material. Wood moves differentially, depending on the grain orientation. This piece was cross laminated! Designed to fail.
What bothers me most about this: he was hired by the university and was not qualified. He taught future teachers to be "not qualified." I had one of those shop teachers come to my shop with a pile of student projects that had failed. Exactly the same reason they had failed, as the desk.
I had a friend that worked for a chain of machinery retailers. He loved to fly small planes and convinced them he could be their service tech. When there was a problem in the field, we would load our tool boxes in a rental plane and fly all over the Midwest to trouble shoot. It was almost always operator error. We'd do some setup work and teach them how to use the equipment.
One trip was to a large kitchen cabinet factory. They had bought a quite expensive automated machine to make cabinet door parts. They were having lots of joint failures and blaming it on the machine. On the flight down we talked about what we might need to know. Nether of us had ever seen one of those machines. Every conceivable error had been made in the factory. Management had no idea, the operator just fed it blanks that kept coming out the other end ill fitting. The guy assembling the doors would put them in the clamp and then beat them with a mallet until the joints closed or broke. Those that didn't break were under so much stress they likely failed in the field.
After watchin the operation for a short time we shut down the machine and took the tooling off. The coped joint tooling was sharpened wrong and didn't match. Seems management had a friend that sharpened all their tooling. He had sharpened saw blades all his life. Didn't mean he knew how to sharpen matched sets of tooling!
The machine had been modified to "increase productivity." Those mods overloaded the feed system to the point it would slip and either run so slow that the parts would burn or they would jump ahead and have a ragged cut. We fixed that problem but had to wait for some additional parts. After all was done we watched the machine run good parts. It cost them quite a bit of $ that they shouldn't have had to spend. If they had just used the Japanese 5 questions solution they would have found the sources of the problem. It didn't take a genius. We just looked at each step in the operation even though we had no idea of what we were doing. If the parts don't fit, the BFH solution may not be the best.
Many of our trips were to remote high schools to show the teachers how to use & maintain the equipment.
I didn't have a license but would usually fly part of the time while he tried to figure out where we were in remote Kansas or Nebraska. Fly around the water tower and read the town name navigation (no GPS) Unfortunately Dwight was killed on a flight to western Nebraska. Likely due to icing. He wasn't found for three days, likely because the teacher on the other end never reported that he failed to show. We had always been careful to check weather before taking off. Maybe conditions changed?