Being sore does not equal growth, it’s the same for sweating. You could have a great workout and not be sweating at the end. For legs that would be very hard, but. Lots of factors play into it, you’re recovery could be good enough to where you won’t be sore, or you could be walking enough to where the toxins get cycled through your blood and destroyed. I’m sure coaches will give a better answer, but as long as you see growth, I don’t know why you wouldn’t be happy.