Ah, you don't like TMs. No wonder.
"Don't like" feels a bit too strong to describe my attitude toward them. Let's call it polite disinterest.

Technomancers seem like an unnecessary addition if you view them only through the 5e lens, sure. That's because this edition has done everything possible to minimize them and delete them short of retconning them from existence.
Well, as I said, I view them through 3e-5e lens. I started playing SR only 2 years back and the group knew 3e and earlier editions (those came out in Hungarian back then). I was curious about how the game1s right now, both in rules and metaplot, so I've started to read 5e too. So, I just doesn't have experiences with 4e, beside reading a bit because of the fluff, like Clutch of Dragons.
So, Technomancers were't a thing in 3e, Otaku were highly tied to the plot. There were no technomancers in the older books, not in the old novels. What I want to say, Technomancers just didn't feel like a profound part of the game, or the core archetypes.
In 4E, TMs were the spiritual successors of the Otaku of older editions. The Matrix had evolved, and so too did its children. No longer bound by tribes or requiring even basic 'ware to connect to the Matrix, when they Emerged, they lived and breathed the Matrix as easily as a child took in sights and sounds. They did things in a fundamentally different way than people who hacked with a link. They were the Swiss army knives of the Matrix, able to do any number of things (though not at the same time), but they paid for it by being glass cannons at times, especially in Matrix combat. They could hack, and they could rig, but the way a TM hacked meant they needed to do things differently than a hacker would. They would focus more on stealth and a devastating opening salvo, and then escaping if it came to matrix combat, while a hacker who didn't take matrix damage directly to their brain could slug it out with their better defenses.
Along with a great many other things the nostalgia-induced 5E Matrix screwed up, TMs have been brutally served by Catalyst this edition.
I get that and I don't want to argue with the notion that they could have been better served by Catalyst, for the pople who do love them. I'm just not into the virtual reality stuff (lot more into the magic part, to be honest) so these differences between deckers and TMs dn't mean anything special to me. I totally get that they're different, i get that some people like the idea of being one with the Matrix and stuff, but for me, they're more-or-less just hackers without decks.
Sorry, I don't want to belittle anyone's favorite archetype, it's really just that they aren't adding much things of interest to the game for me. I'm not really interested in deckers either, but at least those are iconic parts of the setting and gadgets are fun.
But to be clear, I don't want TMs to go away, because others like them and I wish them a better treatment. It's just not a priority for me.