Yeah, I thought of those things. Hey, I have to live with it.
There are regular thermostats backing it up as overrides, in case it gets colder than 55 (turn on heat) or hotter than 80 (shut off heat).
Plus we run the woodstove all winter, and the furnace can run 100% of the time without problem. The worst that could happen if the board fails miserably is that we get uncomfortable.