I find that even using https://open.spotify.com in Safari is incredibly snappier and much less of a memory hog compared to the official client, at least on my own computer.
(I'm not at all trying to convince you to "stay", or even claiming that this solution is as good as a proper lightweight client. Also, I only ever use [free] Spotify to check my own music/page)
As everyone moves towards using Electron and Webviews for their native apps the apps just get worse than their web pages. Spotify, Discord, Slack, and many others are best off without the app. If 2010 was the decade of Smartphone apps I think 2020 will be the one where everyone returns to the web. The only thing really preventing this is Apple's obnoxious refusal to support web push notifications but that's eventually going to change.
I think this will be very good. The native app world will have much less corporate garbage and will be returned to the hackers at least to some degree.
I’m not sure, players like Reddit and Twitter seem dead set on purposely making their web experience as bad as possible to push people towards their app.
(I'm not at all trying to convince you to "stay", or even claiming that this solution is as good as a proper lightweight client. Also, I only ever use [free] Spotify to check my own music/page)