Thanks, I will have a look at that. Serendipitously, I'm in the market for a new music player!
Yeah the Google risk... seems like they came out strong in support of Flutter at their last dev conference, but at the same time it does _not_ look like they're using it for their main apps.
Without expressing an opinion on Flutter as such, it's worth remembering that Google is a big enough organisation that even -some- internal apps being built using it is quite a commitment, and it not having spread further internally could easily be a social or political rather than a technical issue.
I don't think it it's a technical issue. On a technical level Flutter is mostly great. But Google has been doing aggressive cost cutting lately and not having Flutter in use in that many apps makes it more vulnerable.