The problem with relying on Spotify recommendations, and indeed AI recommendations in general, is that they never throw you any curve balls and so never expose you to anything genuinely different.
Right around when I started transitioning away from Spotify, someone here mentioned a CD grab-bag sale at a label I had never heard of. I quickly skimmed through their library on Bandcamp, liked what I heard and took a punt on it. This ended up greatly shaping the kind of music I've been listening to over the last couple years. Spotify never recommended anything from this label and it's easy enough to imagine why. It's not exactly like anything else I was previously listening to. However a human would be able to form more abstract aesthetic connections between what I already liked and the output of that label. If I had read some reviews in a diverse magazine like The Wire, I might have come across this label earlier to decide for myself that it sounds interesting and worth checking out.
That said, an issue of The Wire in one hand and a mobile with Spotify and Bandcamp in the other is a powerful combination!