This is a good topic for discussion. I totally see where you are coming from, and four months mostly sober is a million times better than 4 months mostly drunk! I hate the idea of acting like a slip is the same as drinking everyday.
However, for me, I know that a few times, the only reason I didn't drink is because I didn't want to give up the time I have sober.
So, I agree that I wouldn't really give up all that time - that it's still meaningful, but my commitment to a sober date is the reason I haven't had any slips.