MMS video file size has a default limit set by your provider. However, basically every phone has RCS available by default these days - which will be used in these cases automatically, within the same messages app - except when Apple refuses to allow it because of cross platform interaction.
You stated that iMessage provided this benefit, and it doesn't; it isolates this benefit from being used. "Depends on the app" is just false. It's "depends on the hardware" - google messages even recently expanded RCS support to phones that didn't support it for one reason or another it in April. These data limitations haven't been saving people from issues for over a decade, you're conveying outdated takes.
Handing it to you is an exchange of goods, but making food is a service. Yes, even if they just microwave something for you. I don't think tipping for that particular service is usually warranted either, but foodservice is kind of literally called that