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Apple has a memory problem and we're all paying for it
(www.macworld.com)
This is a most excellent place for technology news and articles.
I was watching a Twitch stream from a programmer and he said the same thing, about Apple switching from bad hardware/good software to good hardware/bad software. I do think modern macOS is so much better than modern Windows, but it’s far from where it was. Though that might just be me being nostalgic; 10.5-10.9 (Leopard to Mavericks) was my personal “golden age”.
I would argue modern MacOS is not "bad software" per se, it's just nothing to write home about. Back in the heyday you describe, it was innovative and quite spectacular compared to the competition. Nowadays it's rivals are better featured in many respects, but it still does everything it needs to.