That's the point. Powder is better than bow and arrows. High tech best tech.
It has been clarified multiple times that low/mid/high tech is a doctrine difference more than a technological one, and not a tier progression.
The current "low tech" hulls are of an older design but have long since been modernised to current (pre-collapse) standards, the lore state everywhere that modular weaponry and shields weren't a thing at all at the time, yet they have both.
Again, there would be no point bothering to have those exist if they were obsolete, imagine being the clown asked to code a spear in an fps.
Right now low tech gets the shortest stick in every competition, be it terrible logistics, mobility, abilities, flux, and even dps/tanking directly related to the previous, i'd rather have 600 flux, high mobility, crap armour and super shields rather than a ship getting a stroke with two medium kinetics that gets danced around by uberfrigates.