Before Gutenberg, I always said that there was no Dev WordPress, but PHP Dev specialized in WP. The block editor came, and that remains (more or less) true.
Before the block editor was a thing, the truth is that WP development at various agencies was largely snippet-oriented: if someone wanted something, they could just copy and paste some code into
functions.php and voilà. The block edit puts a huge obstacle in this process: you have to understand what you are doing.
The intent of WordPress has always been to give people a website without the need for a developer. The block editor just created an abyss between those who don’t want to develop anything at all and those who need to create something new.
Good or bad, this change has no turning back. If you are a developer and still don’t work with the block editor, don’t be afraid. It’s easier than it looks.