Never say safe, especially with the S&P it is a risk and people should understand that, but for most people who predict being able to hold for a long period it works.
A lot of the big user facing changes seem to be more and more app/Google play service updates now. Makes for boring system updates, but at least they happen.
I use an app called Smart Audiobook Player for Android. I download my books from JellyFin and just use that app to play them. JellyFin's audiobook experience is lacking right now.
Not really if you exclude the employer match from consideration.