I suppose it makes sense, when others are wearing a mask, it's harder to hear them and/or you don't have the facial cues that help you understand what people are saying.
However I find that when I'm wearing a mask I feel strangely disorientated and find it harder to understand others, even if they don't have their face covered.
I'll comply with any requirements as I always have, I'm still wearing it in shops and on public transport but I have a couple of theatre trips coming up and having to wear a mask will spoil my enjoyment. It might be a price I'll have to pay but I wouldn't have bought the tickets knowing I'd have to wear a mask and I I won't be buying any more if they are compulsory (the PM doesn't yet seem sure which indoor spaces will be affected).