Ideally. Depends on the update time too. I know flashing ECU tunes requires a battery topper. I’ve also killed a car battery modding my infotainments firmware so it’s totally possible. But most likely Subaru is doing it out of an abundance of caution… Don’t want an angry customer coming saying the update killed their battery
I’ve always been a power user but never minded Windows until W11. Luckily WSL was a great gateway drug for me and I ended up switching to Linux full-time after living inside WSL for a few weeks.