Yes, and then between TUC and PIC, Spacedock was replaced by the even bigger PIC version.
There are probably several stations that size scattered around the solar system. There are the dumbbell-shaped ones in orbit of Mars as part of the shipyards (which probably also include at least one Spacedock-style station, based on "Booby Trap" where the under-construction Enterprise-D seemed to be inside one), and Jupiter Station, and those are just the ones we know about.
As for OP, well, how many times did an attack on Earth actually make it to a siege before now? In TMP and TVH, everything in orbit was shut down by the attacker, in BoBW and FC, the Borg were destroyed before they actually began attacking Earth. We never actually saw what happened with the Breen attack in DS9, so there's no way to tell what role Spacedock did or didn't play in the defense.
Now Jupiter Station, where is it in Picard season 3 episode 10 when the Borg infiltrate the Sol System inside Jupiter? Why Jupiter looks like a virgin planet without any touch of human being when there is actually a station called Jupiter Station, and, if my memory serve right, the Doctor holographic tech from Voyager has a relation with this Jupiter Station (If my memory serve right, the creator, the real doctor whose imagine is being used as the holographic visual appearance came from Jupiter Station). So it is a science station, or a research station. And what is the purpose of a research station orbiting a gas giant if it not monitoring the planet?
Don't you feel weird, when a station with a massive importance like Jupiter Station stay ignorant about some kind of anomaly inside the Jupiter Gas Giant, when an old Star Ship with obsolete technology like the Enterprise D can detect the Borg cube inside the Jupiter easily?
Edit: After I read the Memory Alpha, Jupiter Station actually a very important orbital station for Starfleet, and it is massive. It is also a station that house so many research activity, and equipped with massive antenna and sensors. And because we talk about 25th century, it should be better than the 23rd and 24th version.
Well, I say that it is a plot hole. But let's talk about it in Universe excuse. I hope when Mathalas read this, and if he get Star Trek Legacy, he can address the plot hole that happened in Star Trek Picard.
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