My collection is 2,000 albums, starting with my first album from the late 1960’s. In the 80’s I started collecting seriously with mostly new and audiophile versions. I used a machine to clean all old records, treated with Last, replaced the inner sleeve and an outer sleeve.
The outer sleeves are loose fitting and prevent frictional wear of the album cover. I have never experienced any adverse effects and virtually all my albums are in outstanding shape. I definitely recommend outer sleeves. I've not noticed them being a problem reading the spines.