I don't know about the pistol change, but everything else in that list is something that needed to happen.
A. The sapper change is HUGE, and I am on my knees kissing Valve's feet for changing that. Putting teleporters down when the other team has a decent spy would otherwise result in a waste of time. I actually just stopped bothering, because it was completely worthless to me. You can't run back in time to repair it, you can't rebuild it fast enough to return to your front line equipment, and by the time it's level 3 again, the spy is already back at spawn. Stop complaining about the best change in the update!
B. The scout changes were practically demanded over the past couple months. Stunning ubers was quite possibly the most infuriating thing, as oftentimes the scout could do it from the other side of the map, in complete safety, completely unstoppable. The Force of Nature also had it's knockback nerfed significantly, for good reason. It was broken in its ability to knock back. The boosts to the sandman were also highly welcome. The scout should be much more useful on the front lines now.
C. The spy buffs are also welcome, adding to his ability to remain hidden, as he'll need it.