Maybe you can do both: physical USIM card, but with eSIM functions. So you can move your profile from one phone to another just by plug out and plug in, and install many profiles on one phone and switch between them. There are some products can do it, such as eSIM.me, esim.5ber.com or https://github.com/estkme-group .
I use Porkbun.com. It has modern interface.
Yes unless both my phone and headphone support LE Audio.
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No. Just because I’m not always able to use my own device. If I use other layout and have to use other’s devices (e.g. library computer), I will be confused with normal QWERTY layout.
Yeah, it works well with my Wacom CTL-671.
I prefer to use Fcitx 5 for Android instead of GBoard, not FlorisBoard. Because f5a has much better Chinese input experience than FlorisBoard, and I use Chinese.
I print recovery codes of all services and packed them into a bag.