Part of the attitude is just shtick. It made the video more interesting for me.
Whether you agree with the guy or not, he is more qualified than most to have an opinion. Just look at all those lights! He has spent some quality time with SureFire.
Some of his points are good ones, too. His claim, for instance, that SureFire changed its long-time design of the body tube as a response to LED drop-ins seems to have merit. On some newer models, the head is glued to the body. It does not unscrew. That solves the problem of competition. If you can't get inside, you certainly won't be using a drop-in made by a competitor. SureFire might have chosen to compete by introducing its own line of drop-ins.
SureFire was slow to make the change from incandescent to LED, and in many ways, it is still behind the curve. It is only now backing off its claims that CR123A is the only sensible battery for a flashlight. It's about time. CR123A has a maximum continuous discharge rate of 1.5 amps. There are very few flashlights that can hold to that limit and put out 1000 lumens at the same time.
As a newcomer to the world of high-end flashlights, I was not around when SureFire was in its heyday. Unlike our YouTube fanatic, who has owned and used dozens of SureFire models, I am unqualified to hold an opinion. I have never owned any SureFire flashlight. Neither have I owned an Elzetta. Based on my reading, however, I would probably buy an Elzetta before I bought a SureFire. Everything that SureFire is supposed to be best at—ruggedness, reliability, tactical design, etc.—Elzetta seems to do better.
The exception is a weapon-mounted light. I cannot disagree with the YouTube reviewer when he says SureFire is a top-notch weapon light. Don't know about the Elzetta. It might be, too.