If Geordi hadn't been disagreeable at first, then the episode couldn't have the same kind of heart-to-heart character moments and couldn't have given La Forge a mini character arc. I think his reaction noted the passage of time, as well La Forge now having children to protect and a wife to go home to, and I could see him being salty about Picard putting them all in danger. While there's no doubt that he still respected and cared about Jean-Luc and the others, Picard was not the same man he served with. That man died and a synth with his memories/personality was now in his place. But before Picard died, he had become a controversial figure that it was like open season to dump on in the first season, and that lingers into this final season, considering how Shaw treats him.
The way I could see it is that Geordi would not be pleased at all that Picard has dragged his daughter into trouble, and now is asking him and his other daughter to break the law and sacrifice their futures in the process. Though I doubt it will happen, I would like to see La Forge give Picard a piece of his mind about not coming to him to help out with Data's daughter, because I can't see La Forge being happy about not being involved there.
As much as many of us, myself included, want the team back together, it might have been better for one of the old crew to actually say no to Picard. I'm not saying I wanted to see that with Geordi, and I wouldn't want him being considered a villain by fandom or a coward in the series, but I think it might have been more real, more honest, for someone to turn Picard down. We the audience get what Picard is doing and why, but from the outside looking in, Geordi's initial refusal makes sense.
His refusal gave the character more agency, even if for under an hour, than he had in most of TNG or the TNG movies.
I wasn't a fan of Sidney chewing out her father, but it did provide more character moments/development for both characters and was pivotal in La Forge's change of heart. However, I wish it had been more balanced where she also saw the prudence in his stance. La Forge didn't do anything wrong.