I know people have had success using the command line but for me, it’s just easier to use the flash tool because it does everything I needed to do with one click. You may have the same experienceYou're like the fine print guy at a law firm. Not saying you didn't say it, but it isn't all that obvious.
also, the adb command line doesn't work (can't disable verity or verification, which I tried when I first got the device). The only real way is the flash tool, and this is with up to date sdk tools.