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A dedicated e-reader is way better for reading than a smartphone or tablet. They use e-ink screens which are better for your eyes and for battery life.
Also there are dedicated mobile music players. A lot of them are targeted at the audiophile market and can drive high impedance headphones and have a high quality dac. But most people aren’t audiophiles and don’t use headphones that would benefit from something better than a smartphone.
I usually print a temp tower when I get new filament that I haven’t used before. It doesn’t take that long and if it prevents a failed print it’s totally worth it.