Please, you are making it sound like all tape users are living in fear that their capstan motors will seize up. Many people also 'scare' you that the heads on your machine will wear out and you won't be able to find replacements. These tape machines lasted decades in studios where they were being using all day everyday, so those that sat in private homes still have lots of life left in them. Also, there are still lots of parts/damaged decks available for next to nothing, get yourself one and you can easily keep your machine working for another 10+ years.
Think about how long your DAW lasts, a couple of years then they stop making updates and change OS and your DAW is no longer compatible, your tape deck will probably last longer than any DAW that you can buy on the market today.
mixdown to tape vs pc is really just about what is more convenient/easier for the user as well as the users personal preference, so trying both is probably the best thing you could do.