They could have used same arguments, 10 years ago.
Blender is now a standard. It is not “the” standard for Hollywood.
It does not mean that is not used by artists in big studios.
It does not mean that they never had heard about Blender.
The simple fact that nobody omits it into a discussion about “what are 3D Software applications available ?” means that it is a standard.
OK, there is not a lot of documentation about 2.8 and tutorials using 2.8 UI.
I have a piece of news for you : 2.8 UI is a WIP like 2.5 was.
2.81’s file browser is a lot different than 2.80’s one.
2.81’s Outliner is a lot different than 2.80’s one.
2.8 workflow is a WIP.
2.80 is not able to display different Collections into two 3d Viewport without creating two separated windows. You can do it in 2.81.
You have no Library Override in 2.80. You will have them in 2.81. There will be some feedback and they will probably be different in 2.82.
So, currently, people who are making tutorials, don’t expect them to be still valid in 6 months.
There will be a moment when workflow will crystallize. But It is really hard to say when because of huge amount of projects that have been launched.
When most of big concepts like everything nodes will be a reality in official release ; that would become a lot more easy to make in depth tutorials.
But currently, something like multi-object editing is new stuff for everyone in Blender community. It is hard to think about exploiting such changes, fluently ; when it is partially working or you are simply not used to it, yet.
There will be a lot of tutorials when people who knows Blender will be fluent in 2.8.
But for the moment, they are waiting for missing 2.79 features, for 2.8 original design additions, for community improvement suggestions or bugfixes.
You will not produce a tutorial about Hair Editing as long as tools to cut hair are broken.
You will not take pleasure to create a tutorial about textures with its unsatisfying UI and convoluted way of baking textures. And if you know that Pablo and Lukas have plans to improve them, you are more inclined to wait.
During 2.5x series, UI changes attracted a lot of people. But reality is that for 2.4x users, a decent workflow was only restored for 2.6x series. And after that stabilization, Blender was recognized as a standard by many people while 2.7x series. (If you are not convinced by that, just take a look to Blender youtube channel. There was already many talks at Blender Conference in 2016).
2.8 initiated another cycle. But now, the scale of Blender community is a lot different.
And if your project is ignoring several areas of Blender, you can produce an A to Z tutorial with 2.80.
At last year conference, Juma Jurabaev explained how he used Blender 2.8 without knowing lots of basics of Blender.
He made tutorials about Grease Pencil v.2 but don’t expect him to produce tutorials about motion tracking.
OK. There is not always a person teaching Blender in every art school.
But, nowadays, if you pretend yourself being an artist interested in concept art or previz ; and never had open Blender : you will probably be seen as a young, ignorant or arrogant guy.
Probably as much as if you never heard about Unity use in same domain.
If during a discussion, you say : “I open it, did not understand anything, tried to follow a tutorial, felt uncomfortable and abandon it.” : that is fine.
But if you spread an opinion about Blender without having tried it : nobody will take you, seriously.
That is the big difference between current situation and old situation that was existing, years ago.
People were just repeating opinion of their teacher without really understanding what forged that opinion.
We succeeded to invert that being most frequent behavior. Students are trying Blender and they don’t understand why it is not used everywhere. Well. Reason is simple : it is far to be perfect for every task and they still have things to learn.
But at the end, everybody have to try Blender. It is widely used. So, it became a standard.