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Just to give the actual timings here so that others can see the point you are making.
So DUB-LHR scheduled was 15:50 departure, actual was 15:44. Scheduled arrival was 17:15, actual was 17:38 chocs on, so I'd normally expect the door to open at 17:41 and it could take a couple of minutes to get to the airbridge. You landed at 16:46 so that is a monster long time to get to a gate in yesterday's near perfect weather conditions. The earlier DUB-LHR BA835 service needed just 9 minutes to get to the gate whereas it took you 52 minutes.
HKG scheduled to depart 18:25 and did depart 18:27, giving a T5A gate 23 to T5B, gate 45, connection of 40 minutes (17:45 to 18:25). You were on the edge of conformance (no more than 35 minutes) but equally you probably realistically had another 5 minutes excess time in your real world timings. After that point then the HKG would risk running late. So conformance is pretty close to what is realistic.
DUB has to use particular gates due to the Common Travel Arrangement so while you were a bit unlucky with the bed-blocker, it is a risk there.