While I think you're right on the whole here about "Emacs people," but you did an interesting thing in the first sentence: you contrasted
experienced Emacs user with
junior developer. And I think that actually points to a problem: people who are experienced developers but not experienced Emacs users are going to be in much the same position as the OP's description.
While I know the basics of Emacs, every time I try to get serious with it and make it my One True Editor, I end up spending days screwing around with packages and configuration files to try to figure out how to have similar functionality to what I get either out of the box or with fairly minimal effort in arguably lesser editors. I'm sure Emacs can do all of what I need and nearly all of what I want, but most of the time I'm damned if I can figure out how to get there from where I'm starting.
If I was really going to try to give advice on how to make Emacs more popular, it'd center around the package/extension system. It's great that it has package repositories and a built-in management system now, and the documentation for the core editor is terrific... but the documentation for packages is wildly variable, and what's worse, packages interact with one another, depend on one another, and/or conflict with one another in ways that are just utterly mystifying to a newbie.
I don't care about making Emacs "pretty," and while it'd be nice if it used less weird terminology by today's standards, I can deal with it. What I want is sane defaults and good guidance. Spacemacs' concept of layers -- where I can just say "I would like you to install and enable all the crap that lets me smartly edit PHP files, please" -- is absolutely onto something, although I would still argue that it might need to offer a little less choice by default. Don't make me choose whether I want Helm or Ivy because I have no idea, and for God's sake, enable sensible layers/packages by default: assume that yes, I do want autocompletion and git integration and such. If you must, let me click a button to choose between "batteries included" and "advanced" configuration. This is stuff that mainline Emacs should be doing.
And, actually, that's one other thing Emacs could stand to do better: learn from VS Code's configuration system that lets you use dropdowns and checkboxes and simple text fields for nearly everything, and has a button to go into the configuration files when you need it. Yes, I know Emacs has a text-based UI for configuration, too. I've used it. It's bad. Okay? It's just bad. The controls are non-standard and weird, the organization is utterly mystifying to someone who doesn't already understand Emacsology, just... no. Start over.
As for me, well, when Spacemacs moves the LSP layer to its non-development branch, I'll probably give it a try again. Until then, I'm probably gonna keep doing my technical writing in BBEdit and my coding in Visual Code. (I'm probably gonna keep doing my technical writing in BBEdit until I die, but that's a different post.)