Yeah, as others have stated, whether or not a ship does or does not have shields or a hyperdrive isn't a matter of technology being advanced enough, it's a matter of expense with maybe an element of balancing the extra equipment against things like mass, fuel capacity and reactor size. Fighters launched from larger ships don't *need* hyperdrives. It's a luxury, not a requirement. They're generally better off and more useful being faster and more nimble at sublight.
It's like that old venn diagram, only instead of "fast/cheap/good" it's "compact/cheap/powerful". You can only have two, not all three at once!
As for whether or not the technology has advanced significantly (this also comes up often with KotOR) remember once again that this is not science fiction, it's space fantasy.
Imagine it in terms of a medieval style fantasy then ask yourself: how much have bows (blasters), swords (lightsabers) and horsecarts (spaceships) really changed in the last few thousand years? Hell, even tens of thousands?
Somewhat, sure. But it's very *very* incremental and more about changes in building technique, available materials and slightly shifting requirements as the cultural and economic landscape changes over the centuries than any fundamental advancement in technology. Indeed there's plenty of historical precedent of technologies being *lost*, so it's entierly possible in SW for certain "modern" equipment to be *less* sophisticated than it once was.
Lets say for the sake of argument that maybe, once upon a time all blasters were extremely precise and powered by powerful kyber crystal based technology. But that was back when all of galactic civilisation was restricted to just a few dozen worlds and they had several kyber rich planets to mine. When those mines were tapped and the civilisation grew to hundreds and then thousands of worlds, with fewer and fewer kyber planets to go around, it became too expensive or impractical so other, lower quality alternatives were sought.
Eventually, the technology simply fell out of use to the point where only the early Jedi with their archaic laser swords made use of kyber.
The Delta-7s did have shields
Canon doesn't say if the Eta-2s had shields or not, but legends said they didn't.
By what happens in the RotS opening (the bit where Anakin tries shooting the buzz droids off of Obi Wan's fighter), I'd say it's a fair bet they don't. Or that they're so weak that the Eta-2's own cannons can just blow right though them.