These days there's also a wide variety of manufacturers making them including very sketchy counterfeiters.

So there are TONS of pin-compatible-ish parts from different manufacturers that have related specs with a ton of variation.

Even 20 years ago, places like TI and ADI were offering parts that are spec-dominant over the 741. Literally every parameter on the datasheet is equal to or better than the 741, and pinout is the same.