It is not my case, I have quite strong nails, fortunately, but you can play without nails in a quite pleasant way. See, for instance, Rob Mackillop in this clip https://www.youtube.com/watch?v=vfulgD6Lieo
. And there are others. If you search the Internet you will even find an explanation from Rob on his technique for playing without nails.
1972 - Kuniharu Nobe #8, 658/51, Spr, CSA RW, Tokyo, JP
1979 - Ryoji Matsuoka NO.40, 650/51, Ced, CSA RW, JP
1987 - Aria A558, 650/51, Ced, lam RW, Nagoya, JP
2014 - Hermanos Camps Master Nº 3, 650/52, CA Ced, MG RW, Banyoles, ES