It's missing so much that iOS has. They've said they are releasing a rewritten app, but keep delaying it.
For example, there's no threaded email support on Android.
https://proton.me/blog/2022-roadmap
As discussed in the January update, Android will require more work as we are rewriting more of the application, with a big focus on performance and stability. This means some Android features you have requested for Mail are not in our immediate scope for delivery. In particular, conversation view (also known as threading view) won’t make it into the first version of the new Android app, but we hope to deliver it soon after release.
Reddit is going crazy because they are calling him a millionaire. I'm sorry, but making a million dollars over the past decade makes him paid less than a regular developer, and 1 million dollars can't even buy you a crack shack in Canada.
Remember, Canada is the most expensive place to live. We have the most expensive housing and internet/data plans in the entire world.
Think logically. Don't think like childish Redditors.