Except for systems with very limited resources, systemd or not won't make much of a difference in performance. A lot of tutorials on reading system logs and managing background services will assume that you are using systemd.
I've only ever used distros with systemd, not necessarily with intent, but because it was the default and well-supported. Probably won't switch unless
- Debian switches
- there's a change that breaks my workflow
- it somehow starts phoning home to a big datacenter.
If OP indeed has the 6th gen iPod Touch, not the classic, it won't be as rosy as most of the comment here suggest. From my experience replacing the battery on one, you need a hair dryer to loosen the glue and pry off the screen, then a soldering iron to replace the battery since its ribbon cable is directly soldered to the logic board. No storage expansion or custom firmware is available for such iOS devices, as far as I am aware.
Also watch out for low-quality replacement batteries, the first replacement I tried only lasted around an hour on a full charge.
As much as I have ideals for my technology use, I will admit that
- I have some audio in the background playing half of my waking hours
- If I'm tired of words, I'll put on music, vice versa
- If there's an unanticipated pause, I first check if it's still playing correctly
- Yes I am afraid of being stuck with my own thoughts when I go to bed
- I think of the time spent waiting in line as nothing but wasted unless I use it as an opportunity, perhaps to read a saved tab on my phone
- All of this might not be the cause of it, but it definitely doesn't help my mental fog and fatigue