I used to believe this for like 10 years. And I never had any custom environment. But then I was at a job where I was forced to create a custom dev environment, because theirs was awful. And then I had to transfer my scripts to another machine, and it turns out, it was actually really easy (just have a git repo you can pull from anywhere). I wasted 10 years with a subpar dev environment.

I'm actually at the point now where I just can do `curl https://website.com/my_environment.sh | bash`, and it sets everything up for me. So even if I SSH into a machine for a brief period of time I'll have my environment with me there too.