If you need it for Android, I tried quite a few. I had the same requisites, offline, lyrics for flac files, I ended up using Metro: https://f-droid.org/packages/io.github.muntashirakon.Music/
Very minimalist and do the job very well. I use the field "Composer" to sort my lists.
A significant security drawback with many alternative Android operating systems is that they either require or are commonly used with root access, which inherently weakens the device's security model. GrapheneOS, by contrast, is designed to be used without root access. Traditional root implementations fundamentally compromise Android's security mechanisms like verified boot, app sandboxing, and the principle of least privilege, making the device much more vulnerable to exploitation.
South american here, I grew up knowing those animals and capybaras and I find fascinating when the rest of the world get to know those creatures and have a blast. It is cool that something trivial for me is something amusing for someone else.
Here are two interesting( I guess) shots:
Google turning Pixels more and more complicated to have alternative OS isn't a good sign. I hope GrapheneOS come up with a open source and secure phone alternative. Fairphone or TeraCubes using alternative OSes aren't private or secure enough. I hate to say that but if I would be in the market today for a phone I'd be considering an IPhone.
Do you have a Netflix plugin 4K setup working?
I ask because even in the plugin page there are a few indications contradictory that indicates otherwise:
First is the warning in the main page: "DUE TO CHANGES TO THE WEBSITE THAT PREVENT THE PROPER PLAYBACK OF VIDEOS, THE DEVELOPMENT OF THE ADD-ON HAS BEEN SUSPENDED. THE VIDEO PLAYBACK, WHEN IT WORKS, IS LIMITED TO SD QUALITY AND ONLY ON SOME LINUX/ANDROID DEVICES."
Second in the section "Reference table of high resolution" there is a footnote saying the following: "*4 Hardware decoding and 4k are supported only to devices with Netflix certification, Widevine Security Level L1 and HDCP 2.2 hardware."
Third in the list of 1080P 4k Android tested devices we see basically only Netflix approved devices: https://github.com/CastagnaIT/plugin.video.netflix/wiki/List-of-1080P-4k-Android-tested-devices
Just a heads up about this approach, non approved boxes are limited by stream providers such as Netflix to 1080p HD:
https://androidpcreview.com/netflix-hd-android-tv-box/
So if you have a 4K TV and a 4K Netflix plan but plan to use a "custom" box your service will be limited to 1080p HD. Not entire bad but can be a frustration point if you get all built and realize it later.
This looks promising, very similar to Metro but an active project. Thanks for sharing.