the Made in Abyss ost by Kevin Penkin is one of my favorites to listen to

>how many inputs it has for convenience

Except an analog input. I would have gotten a unit if I didn't listen to vinyl

320kbps is completely fine. The quality differences between that and lossless music is not very big even with the most detailed headphones. I have to focus hard in order to hear the differences with my headphones.

Headphones will always be the biggest difference in audio quality/listening enjoyment. Generally when you go from cheap (<$100) to mid priced ($150-$600) is when you'll hear the biggest difference in audio quality. After that it's all diminishing returns, and you'll have to listen to more high end stuff ($800-$1500) to find if you value those smaller improvements. After that higher end stuff, anything more expensive will be less of an improvement and more of finding whatever suits your tastes most.

You also have to remember that different people will like different headphones. Don't take peoples' words as gospel, and know that you'll only know if you'll like a headphone by listening to it with your own ears. I would not have my favorite headphones I have now if I listened to what other people liked the most.

Go to an audio store if possible to try some stuff out. If you're in the US, my personal favorite stores are The Source AV (Torrance, CA), and Audio 46 (New York City). Both of these stores are the biggest in the country, and are absolutely amazing. If you live near, or are on vacation in these 2 areas you should definitely head to either store because you won't regret it.

Well I think CDs are good if you want a physical medium for music, but in general lossless streaming services do the same thing and are a lot cheaper/convenient than collecting CDs.

This is definitely true. However, most songs sound fine, and I think people over exaggerate how bad your average bad recording can sound. Yes, it can be bad, but in my opinion it’s never bad enough for me to not want to listen to a song I enjoy. Half the time you have to focus on the music extremely hard to even find anything bad about it!

>Would buying one of these headphones just to listen to music on spotify be a waste of money?

Nope not at all! It's actually pretty hard to tell the difference between Spotify premium, and something a bit higher quality unless you know what to look for. If you really do want something higher quality then you could switch from Spotify to another streaming service (I recommend Qobuz personally, but there are others like Deezer, and Tidal)

Step 1: stop losing your earbuds

Step 2: congrats you haven’t lost your earbuds

Step 6: after multiple repetitions of steps 1-5, know your preferences, and become more satisfied with your gear while still buying more

Well? How do you like 'em? I have the DT990 Pro which is basically the predecessor of these, and it's great