Good leather is still very much available, most people have just developed a habit of seeing it as “too expensive”. When we got a sellier to make a nice dressage bridle, I asked her to send me a few scraps out of interest, and true english bridle is still as nice as ever.
One issue today is people are brainwashed into thinking that soft=good. Good bridle leather starts out pretty stiff, and only gets supple with age and use. I laugh when I see tack nowadays with crappy (but soft) leather over a synthetic core…mfgrs just making what (uninformed) people want.
On the western front, I’ve yet to find an instance where a canvas rub rag, block of saddle soap, and a cake of beeswax won’t end up with a lusterous edge with a good dose of elbow grease. That’s on good leather, however, not the stuff you find in most tack store items (even Herman Oak has grades…)
Hand sewn gear is more expensive, but so is buying a new bridle every few years.