Why people love old track mod.
Many reasons. I like fast open road courses, probably my favorite is "Spa67"; long fast straights, broad sweeping turns, hairpins, S curves, chicanes, elevation changes ...it has it all. Compare that to what passes for Spa today.
Looking at modern F1 tracks, they are all flat, bland, featureless squiggles; mostly medium rpm, medium gear turns connected by short straights, surrounded by such huge runoff areas that spectators need binoculars. Any older tracks on which F1 still runs have been castrated by chicanes thrown in ever couple of hundred yards. Monza, once known as a high speed track, ruined by chicanes; nothing remains of the great Hockenheim but a little club circuit; Suzuka had a great flow til the addition of that horrid Casio chicane; the most egregious example being that "chicane of the month" track - Silverstone:
From 1949 til 1975 a great track, then the ruination began. F1 boasts of the world's fastest cars ....why don't they want to race anywhere that lets us see that.
Another reason for old tracks is that many great circuits no longer exist - Kyalami, Riverside, Bridgehampton, Keimola, etc.; and many races, like Spa, were held on public roads, which still exist... but not for racing. But in sims we can still experience the original Brno, Targa Florio, Rouen, Solitude, Dundrod.
Many "old" tracks are still in use; rather than the uninspired modern F1/GT tracks, give me Road America (aka Elkhart Lake, unchanged since built in 1955), Road Atlanta, Watkins Glen, Mid-Ohio, Laguna Seca, Lime Rock Park, Mosport, Brands Hatch.....