To start with, I'll do the two that stick out the most:
1. iOS limits you to 1 timer at a time. On my android phone "Okay google, set a timer for 10 minutes. Okay google, set a timer for 20 minutes" resulted in two timers. iOS will only let you replace the older one. This still bugs me since it changes how I cook a bit.
Another for the list:
Progressive web apps seem to only be addable to the home screen from safari. The "share" button on firefox-for-ios just doesn't have the option.
This came up because Japan's immigration app is a PWA now (awesome!), which meant I had to open safari-for-iphone for the first time in months (bleh), since I kinda do want offline access to this one.
@ek I ran into this too!
On iOS it seems I have to use Safari. No other options. Wish this were better
On Android, only Chrome seems to be able to make a fully fledged PWA. Firefox you get a home screen icon, but it basically opens a single tab browser instance
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