I have no idea what backend developer means to this or that person. It seems to mean "not frontend", so like, directly interacting with a database and possibly using a compiled or even unmanaged language? But still often deploying through something that looks like:
Haswell <- Borg Hypervisor <- Borg Pod <- KVM Hypervisor <- QEMU guest <- docker-compose <- docker <- golang
?
I'm talking about hackers. I remember being like 24 and and a colleague of mine (legend) had never worked in JavaScript or really the web before was on our pod that got tasked with writing a browser for J2ME and BREW that implemented real web pages.
He goes home that weekend, and he comes back on Monday with a stack machine written in JavaScript (ECMA-262, we ran it on Rhino back then because Spidermonkey was a whole thing) that executed a very cute subset of JavaScript, including lambda closure and therefore Church encoding / untyped System 1. I was like whoa, why in JS? "If I have to implement it in a month, I'm already two months late to start learning it."
Is that guy a frontend developer? Backend? Full Stack? He had worked on DSPs and audio before, and on video codecs and embedded.
My comment above about some of this stuff is harder isn't a diss to anyone, it doesn't make me a millimeter shorter that Carmack is so tall, walking around in some rarefied air of genius I can't even formulate a picture of: it inspires me to work harder, try more ambitious things, push every day a little past yesterday's limit, and it has for more than 30 years now.
There's nothing wrong with programming be a job, it's a perfectly reasonable life choice and a very sensible one in light of life's other demands and opportunities. But some of us fucking love it, think about it all the time, live to be good at it. That's a different set of outcomes. And it does grate a bit to have everyone pushing this "it's all the same, we're all the same, it's one equivalent thing", that's my passion you're talking about, I take great pride in my life's singular ambition and pursuit. We're equal but we're not the same.