The Beatles (especially John) also hated the tedium of re-recording vocals to layer them, as is common in audio production to improve the impact of vocals in recordings.

Their engineer ended up coming up with a technical approach we call ADT (Automatic double-tracking) to artificially duplicate and layer the vocals without requiring the artist(s) to re-record vocals.

IIRC, Richard Carpenter took this to the Nth level. He found the recording equipment with the largest number of tape tracks - 28 - and used them all to layer Karen's voice.

She had an amazing voice, but she also stood out because of his technical nuancing of their sound.