Been working fine for me, but your experience is your experience. The github for their web app shows recent and regular updates so doesn’t seem to be abandoned at all.
Discussion
My experience comes from doing a lot of searches for peoples’ first Nostr notes and had much more success finding them with a combination of nostr.band and advancednostrsearch than I did using Primal. I gave it a fair shot.
Also I just tried the Primal destkop search now and it complete froze my browser. So that really doesn’t bode well.