You have all the rights to be bitter. Technomancy has been neglected badly.
BUT: I donīt think the Concept is doomed by design. Quite the contrary: By making the Complex Forms more like the Matrix equivalents of Magic Spells they actually put everything in place to make a TM act and feel different than Hackers.
But THEN, they just didnīt deliver. There are barely two pages of Complex Forms, and they either offer nothing spectacular or have way too high Fading Values or both. And the Echoes didnīt help either.
Only the Sprites turned out pretty strong (if not even a little bit OP). But itīs a freaking headache for most GMs and PCs to have a Petnomancer at the Table. You have to micromanage your Sprites, their OS, Inititiave, Damage tracks, Marks and whatnot. You have to plan a lot in advance, making schedules for registering your sprites and planning your attack. And IMO, that sounds more like the Deckers way. But in 5th Ed, somehow the Deckers are the quick and flexible types, while the TMs have to stick to their limited options.
And if you donīt play a Petnomancer and spend all the legwork/party cuddle time with the fun and engaging act of registering Sprites, you can practically kick it. The current Echoes and Sprite are by no means impressive enough to compensate the TMs weaknesses: the need for high mental Attributes, Skills, Resonance and Edge, the Dangers of having no Cold Sim and taking every box of Matrix damage straight in the face, the loss of Resonance through augmentations, being hunted and feared by many, not to mention the weird choice of net letting them have a PAN with their living Persona or have a direct connection without the Skinlink Echo.
Are they screwed? Yes, they are. But they are NOT beyond redemption.
What TMs need the most:
More Complex Forms (usefull ones with a reasonable Fading Value. Do not take the existing ones as a model! )
More Echoes (again: usefull ones that are worth the Karma. Not a basic functionality a Decker could buy for 250 bucks at Chargen!)
Do TMS also need Errata/Omission of the Stuff already implemented?
Yeah, they probably do. Then again, there isnīt much to change/ommit, isnīt it?
And regarding the TMs weaknesses mentioned above: Not all of them need to be repaired to make the TMs work. TMs are not Deckers. Instead, try to give them unique Skills that outweight these weaknesses.
Quick ways of messing with with your soroundings. Forcing nearby Devices in Wireless Mode. Misguided Weapon Systems. The "Laughing Man"-Hack. Spoofing a SIN.
And then, when these basics are fixed: Add the flavour. Streams, Paragons, additional Sprites, Dissonance, Fluff, Game Tipps, Sample Characters, the obligatory CFD chapter everyone craves *cough*...