The ECJ decision might well make the EU relutant to agree to an extension and a PV
They want the Uk either in, or out,
not gameplaying with A50 to try to force a better deal (which they won't agree anyway)
The UK's problem has never been lack of time, but being ignorant, arrogant and totally unable to make up its mind on what it wants.
The UK negotiators were not given a clear mandate and goals, like Barnier's team was.
howabout The EU Commission had to take charge of the negotiations, because individual members are not allowed to negotiate trade deals, "mixed" deals or anything resembling Withdrawal Agreement.
Yes, it gave them extra "heft" - that's the main point in being part of a powerful trade bloc,
not having little countries like Ireland isolated and bullied by the much larger UK
Also, it would have been an impossible nightmare to ever get a WA, with 27 negotiating teams trying to stay coordinated
Much better to have one negotiating team, that gets its instructions agreed by all 27 and keeps checking back with them.
Barnier seems to have gone to the absolute limits of what he was allowed to give away, but at least all 27 agreed.
Opening up the WA will mean individual members wanting some of their concessions back.