Lack of commitment to updates from manufacturers, even Google only promise 3 years of feature updates to their Pixel devices and most manufactures offer 2. Meanwhile, I am on my 5th year of feature updates for my XS.
App Quality is also lacking compared to iOS as a general rule.
I had an iPhone 4S, 5, 6, then switched to Android for 2 or 3 years, then switched back to iOS with the XS but I use a Pixel 7 Pro for my work phone daily (no restrictions) and have been using Android regularly (before work devices it was with Nexus tablets) for around 12-13 years now and develop apps for both iOS and Android.
App quality really is the big one for me, just seems like even popular apps are less refined. But the most annoying thing is how for say a Samsung device I seem to need to backup in multiple locations and a restore isn’t restoring everything including all settings, and app layouts and stuff. On my Fold 2 I had to factory reset the device due to it draining battery in 2 hours and it took ages to set everything up again while on my iPhone it‘s basically just a normal setup and everything is restored from the backup.