What are the drawbacks of taking this window/aisle solo seat - 71A on Boeing 777-300ER?

(Yes, this is late (he's presumably been to Hong Kong and back by now) but it popped up in the sidebar and no one explained "why")

The difference between this:

And this:

Is that the first one came from your carrier's online booking system and it has to:

• be adaptable to many aircraft configurations
• work with almost any browser, even the old ones
• be interactive with the user

To accomplish all the above, these seating plans are usually implemented as tables which means the rows and columns have to line up, just like a spreadsheet.

The second picture is not interactive and is a very accurate representation of the seat locations.

Rows 71 and 72 are 2-3-2 rows instead of 3-3-3 rows. The aircraft is getting a lot narrower back there and the airlines ran out of squeeze space.

Advantages of those rows (if you have a window seat) is you are not pushed up against the window - there is space for your bag between the seat and the wall.

Disadvantages of those rows are you may not have any recline - the seat may hit the wall. And the aisle has no more legroom than a middle seat as it is basically in the middle of the row in front of it. The aisle itself cuts through the space where the 3rd seat would normally be.

And as most airlines serve meals front to back, you will probably be left with the "Would you like fish, or fish?" choice. Cold.

With apologies to the cabin crew here, the back rows are usually the nastiest ones on the flight. Unless, of course, the bulkhead row has 3 fussy babies in it.

I am not convinced "seats in close proximity to a bathroom can be bothersome," is entirely a matter of opinion and since not answered above offer some reasons. I suppose these may not bother some people but I do see a difference between seats close to a toilet and those not, regardless of whether an individual's assessment of these is favourable or adverse.

Smell is definitely one, though by no means on all flights. I’ve known one plane delayed while cleaners were brought back on board.

There is more activity and irregular noise, so distracting for anyone trying to concentrate or sleep.

There will usually be crowding at times, so perhaps then difficult to access the overhead storage (of which there may be less anyway).

Congestion might also lead to the odd nudge of aisle passengers and also prevent them stretching their legs into the aisle.

The toilets may form a bulkhead such that the row of seats immediately adjacent and facing the bulkhead does not have any space underneath a row in front. There may be some compensation from not have a seat back reclining into one (specially at meal times for large people) etc but for a tall person even the few extra inches that a bulkhead row might offer may not, on a long flight, compensate for the reduced legroom.

On board entertainment may be less 'personal' (no screen on the back of a seat in front) and a platform for meal trays may be less convenient to set up and take down. Some aircraft (including the Cathay Pacific 777-300ER in this question) do offer personal entertainment screens in some or all bulkhead seats, but these are usually either mounted to the bulkhead or fold out from a compartment in the armrest. In cases where a flight attendant jump seat is mounted on the bulkhead, though, personal entertainment screens are less likely to be present.

In the particular case of 71A on a Cathay Pacific 777-300ER, the seat is close to the aft lavatories, but it is in front of the lavs rather than behind them, so it's not a bulkhead seat.