Interesting logic on the seat strength required - not sure that BA's Business class long haul have taken that into account. I'm also fairly certain that that was never considered on BEA's Tridents - where the front 2-5 rows were wrong way round.
BA seems to be the only company to have tried flying backwards. Personally I love it, but a high percentage of PAX seem not to be of my opinion, which is nice coz getting seats is easier.