If FAs w/ service carts are between PP and economy lavs, I have absolutely no problem with affected pax (economy or PP) using forward lavs. I’m also not going to get out of my Polaris cocoon to make sure there’s a cart blocking their paths.

Exclusive use of forward labs is not promised and should not be expected. That being said, the vast majority of passengers use the lavs in their cabins, as REQUESTED (not REQUiRED). Anyone with strong feelings about exclusively of lavs to cabins better not be hypocritically seen using the 2L lav of a 752 if “their” lav is being used by a reader’s digest reader. I often make use, even though riding up front, of that lav and of the lavs in back of row 4 of the grounded 777s, even though they’re not “mine”.