High tech are only glass cannons in a sense that there is no reliable second layer of defence they can fall back to, their shields are, however, universally durable, and lack of either baseline high top speed or mobility system is an exception not the rule. Generaly speaking almost entirety of high-tech line-up are strike ships. The damage increase you get from HSA, however, isn't enough to turn your regular non-burst beam into a strike weapon, neither its enough to give you an edge in out-brawling ballistic oriented ships. In my opinion its just fundamentally flawed and can't be redeemed with minor stat changes alone.
Exception not the rule? Do you play this game?
Wolf, Shrike, Fury, Omen, Tempest, Apogee, Astral, Odyssey...
And before buffs Medusa, Aurora as well.
Shields take everything as flat damage, and they are tied to flux capacity which gets eaten by the utilization of excessive weaponry that is needed to commit into strike dmg. And this is why using these ships is so *** annoying. You can make them viable, ridiculously viable.
You need various skills, including stuff like ordnance expertise, field modulation, systems expertise. And to fire, it is nearly impossible without stuff like gunnery implants, otherwise the dumb flippin' dean dingus ship is going to fire all its shots at the enemy like it was playing Hollow Knight/Celeste on vsync.
When people talk about high tech ships being durable what they tend to omit is that they have built-in like twelve hundred s-mods into them, and those are usually Hyperion. And Hyperion is not easy to kill. Not at all. But Omen? Omen is only good at surviving cause it has like... Good mobility, small profile, and works around enemy ships which are too slow to catch up with it. And lesser ships don't have a good loadout to deal with its shield heavy profile. But if you employ kinetic weaponry and rush it down, it is usually a freaking balloon of blood ready to pop open.
Most high tech ships can't get close at all. They will come close, start overfluxing, panic and then start awkwardly shuffling away. Have you ever seen like 3 Furies fighting a Legion? It's *** comical. They can't do anything, they just walk up to it, fire at it with their minuscule 600 range lasers and then go like "oh, no... I'm almost at max flux".
This is also why Tri-Tachyon sucks so much ass, and Remnants eat the *** sun with a fork and a knife.
On one hand, you have Tri-Tachyon which get their officers at the freaking Wendies. They like find people hibernating inside their fridge or whatever. And then they put them to pilot a forty morbillion dollars spaceship. And it's like a lvl 1 officer talking to you on how if you hurt them, they're going to sue you.
And then on the other hand you have Alpha core spam which are like "I HAVE ACCESS TO OLD WORLD'S KNOWLEDGE" and then they zoom around with 0 weaknesses on their ridiculously overpowered spaceship with perfect accuracy, impossible to pierce shield, broken mobility and access to 10 times what would usually be normal damage, cause all these things work together and cause a freaking feedback loop strong enough to break open a wall made of stable flerovium.