The problem is that people really do not understand the comparisons they make.

It has been stated that virtually every other airline offers free access to select any available business class seat at time of booking. AFAIK that is simply untrue. Many airlines in fact block preferred seats for their elites and the selection available to non-status passengers is quite limited.

BA operate a different system whereby with the exception of Gold blocked front rows in CE , all business class seats can be purchased. Everyone enjoys free seat selection at check in.

Some don't like this and look for faults in it. It is often said that this policy splits up couples. There is little evidence to support this. If no seats together are available when doing OLCI, the check agent at the airport may be able to help or the crew may be able to organise a swap. As a reference point, since this policy was introduced several years ago, I can't remember many threads on here about being separated from partners or traveling companions happening on a regular basis. There have been a few one-offs, particularly during IRROPS, but that's about it.

BA's approach favours its status passengers, particularly when booking late, and is seen as a benefit by many, myself included.

As a parting thought, hotels often charge extra for rooms with a view. Status customers often get upgraded to those rooms for free. You know when you book that you will get a room, but if you want a room with a view and do not have status, then you have to pay extra. I see BA's approach to seating as pretty similar.