In your own recipe for CTM you add bloody lemon juice!
Yes, you're right SS, I did say I like to add the lemon juice to give it a "slight tartness"......but I'm not sure that adding 1.5 tsp of lemon juice can be reasonably compared to adding about 4 tbsp of yoghurt in a single serving.
I guess it's all about balance (with what are, otherwise, completely different CTM recipes).
I have no hang ups with someone leaving out the lemon juice (in my CTM) if they prefer it without. I certainly don't find it too tarty, by any means, with it in.