>MAME's best days were indeed the late 90's and early 2000's.
Wrong. The best days back then were the various forums of web sites (many no longer exist) in which arguments, bickering and trash talk of which console systems were the best or argument threads on other topics.
Game emulation was still a ways off unless one only liked well known 1980s era games and even then exact emulation timing may still be off a bit. Haze and Heihachi_73 already said what needed to be said.
I miss the long ago early era MW loony bin forum years when posters would trash each other with funny comments (mainly kidding around with each other), but as MAME emulation continues, the newly supported stuff is way too awesome to ignore such as support for Casio RZ1.
And then what could be possibility in the future with other Casio emulation.
This is why MAME gets better even though there is a learning curve if wanting to do specific computer emulation. Other than that, there is no contest compared to the early beginnings era.
If there is any correct software complaint, point to M$ and their Windows 10 products.
*time to now sashay to some funky soul style Burger King 1970s ads*
Burger King - Have It Your Way Commercial - (Soul Version) - 1974