170s have had such seating oddities, for lack of a better word, for the last 15 or more years, so it's nothing new! 350s have as well.
Plus what about all those 142s, 143s, 144s, 150s, 153s, 155s, 156s and 158s that have had seating opposite the lavatory for multiple decades?
There is one advantage to seats there mind. If you've got a long journey ahead and you've just boarded with a large coffee, at least you're well placed for quick access! Of course, that's assuming they're not locked out of use...