I'd also like to add the Dominator to this line of thinking being 30 speed. Even the Onslaught speed should be reconsidered given the change in design concept for Low Tech.
I don't think the Eradicator, Manticore, and Vanguard were intended to redefine low tech, but simply expand options.
That entire patch was to refine Low Tech. To make it not "worst tech". The dev himself spoke about high cost high performance, as in fuel burning/high crew usage/high supplies/simple ships that get results.
I feel like he tacitly acknowledged that making all the low tech ships slower was crippling their performance, not only are they using inferior shields but those shields take more hits because the ships handle like a bathtub. "Eradicator, Manticore, and Vanguard" and including the Lasher because it was reworked into a very good low end ship.
I feel like Onslaught and Dominator being ultra slow is a throwback to before the current ship design principles were expanded.
Out of curiosity, have you tried modifying Enforcers locally with say, 80 or 90 speed? How do they feel balance wise against Hammerheads and Medusa? My guess is it'd be a bit much with their cruiser tier tankiness. As it is, even with base 60 speed, if configured for it, an Enforcer can basically wipe any AI controlled destroyer in less than 10 seconds between flux free missiles and pursuit capability.
Do you understand why that is happening though? Without that speed the extra tankyness does little more then allow it to take more beatings for longer. That tankiness isn't increasing it's damage output. But it the ship is fast and tanky it can escape and recover, if it's slow any tanky then it just gets hammered to death.
Slow ships ironically make the absolute worst use of heavy armor. Slow ships also make the worse use of shields for the same reasons.
This games entire design rewards speed. Who dodged the reaper? Who retreated and recovered to reattack? Who skirted around the back and shredded the engines? Who has the most uptime and least downtime because of travel? The faster ship(s).
Those 3 ships are never doing those things. In many exchanges,
not all, all that extra armor does if give you a slower death.
Anyways I'm not asking for specific number or suggesting nothing needs to be adjusted accordingly. If the Enforcer was faster it could have less armor and feel just as tanky because it could avoid having so many shield blowouts by avoiding and escaping attacks.
No one is investing heavy into armor hull mods to face Omega content. This is an example of why speed matters in general. I'm not saying that an enforcer should be doing that content, I'm saying it to highlight the importance speed plays on ships in an actual fight.