Also there’s the style of delivery - old acting used to be very exaggerated and hammy, then there’s the kind of flawless but somewhat natural style that OP is talking about, through to today’s more realistic “mumbling” style that everyone complains about.
Klear@quokk.au 1 day ago
The old hammy style ties back to theatre. Performing live to an audience in seats that can be relatively far takes some degree of exaggeration to seem natural.