256g is not enough.

My laptops are 65w, so, to me, it does not make sense to buy a smaller power bank, but you are right. The max PD on decks is 45w

Games and a good 65w power bank if you want play on long trips.

It’s far from bricked, don’t worry. It’s an inconvenience, but your boot section broken for some unknown (or maybe know) reason. Just reflash it and call a day. Boot sectors can be rescued with right tools, maybe worth a try. Try to look for arch linux boot recovery or steam os boot recovery. A tutorial should pop off. This is very common issue in Linux world. Also, you can plug an USB c keyboard and check if the previous options work. But reinstall os is the quickest fix.

Excel macros will be broken (hard) on libreoffice, unfortunately. I have 365 at work and use the web option. I think proton can do the trick for offline use, but never tried myself. If op don’t need macros, then libreoffice all the way.

Dead cells and wreck fest