Issues with email loading on iPhone without Wi-Fi and charger

i‘ve read several issues about this design choice of Apple. It‘s a bad choice. Why?

I have a 20GB dataplan for a few Euros/month so I don’t care about „WiFi“.

To receive my emails I have to start the email app and force to get my emails (swipe down) simply want to receive them always!

When I put during a meeting my charger in the phone the emails come in and the beeping starts.

Why this fixed design issue and are there no adequate settings for this. Android users can configure it all. IOS users are the dummies. Of course there are numerous workarounds but why to tap in all kind of settings to work around a bad design choice? Apple please !

[Re-Titled by Moderator]

Original Title: EMail loads only when WiFi AND charger are both „on“