This one seems like it’s very accent-dependent. A cockney geezer will definitely say “be’aah”, but a geordie would say "be’eh and someone from the west country would say “betterrrr”. I think the American pronunciation makes the R sound a lot longer (you can tell I don’t know all the property linguistics words!) so anything shorter probably sounds weird to you.
That’s a new one, what’s wrong with Rs?
Most English people have a non-rhotic accent, meaning not pronouncing the r after vowels so words like “better” become “betta”.
This one seems like it’s very accent-dependent. A cockney geezer will definitely say “be’aah”, but a geordie would say "be’eh and someone from the west country would say “betterrrr”. I think the American pronunciation makes the R sound a lot longer (you can tell I don’t know all the property linguistics words!) so anything shorter probably sounds weird to you.