I’ve done one cover with this technique. As a pick player (well I play more and more with fingers but I’m still mostly a pick player) I compared the two techniques and I greatly prefer the pick. it gives me way more control. But the fingernail technique is still a pretty interesting technique in my opinion, as it gives you the option to instantly mimic the use of pick without having an actual pick. pretty useful if you play a song with alternating fingers and you just want a part with the pick style (roughly).
as I already said, I think every technique is worth a try for everyone : even if you don’t like it, it will give you an option to enhance the range of expression you have with your instrument.