Glock slides are not the best of what’s available.
In fact, I’d say their slides have gone downhill over the last few years. The machine work on the hood of the slide is messy compared to what’s out there. If you haven’t tried some good aftermarket slides you should. The material they use seems to have a greater propensity to rust and they only make boring duty based designs.
Glock does have the best trigger housings and trigger bars. Their slide internal parts are good but their firing pins, except large frame pins, are less than ideal and have a tendency to break at the tip and the lug. Their frames are solid too.