This style of restaurants feature menus that are very labor intensive. Often they are generationally owned. When the old owners are unable to keep them going, the younger owners are frequently unwilling to put in the work to prepare such complex dishes. In another decade or so there won't be any of these legacy places.
Enjoy them before they disappear.
the good ones around here have done exactly this... the one we used to drive 30 min to go to, shut down a bit after Covid... replaced by an indian place, that shut a few months later.
the one that's much nearer to my house, as stated above, kids grew, up, owners retired, bought by a Mexican family, then within a year sold again, not been back to see if it's holding up. ( but it's just around the corner from the House the "Mrs to be" and I are buying..)
now, more recently, we just got 2 Indian restaurants open recently. one bought a "local institution" type place, and rebranded, that fell apart, and then they went strictly Indian, we've been once, for the lunch buffet, it was....
okay...
the other, bought the "Rapid Fired Pizza" location that closed about a year ago, opened by a family that has another Indian restaurant in Cincy. been once, so far,
Much Better than the other place. good enough food, they didn't spend much to redecorate, it still has the Rapidfired logos on the walls, etc. but, it's good enough for the whitey's in this town.