Thanks and yes I agree totally on the bezels being a non-issue. As I was trying to explain to someone else earlier you need to see the display in its normal setting, not in a product photo or brightly lit Apple Store where the lighting highlights the dark bezels. You also tend to be focussed on the bezels in that environment whereas when at home, you are focussed on the content. Lastly, in the Apple Store, unless the displays are being powered by a 2016 MBP then they are not running at 5K regardless of what 'About This Mac' says. When I viewed the 5K in the store it was being powered by a Mac mini.
I share your concern about having to deal with LG support. My 14 day period has restarted due to getting a pair of replacement displays. I'm still evaluating them but I have to say, one of them is still losing sync every so often. I'm keeping a record of when it does it and once I get a clear picture of how often it happens, I will try each display on its own to see if it is one of them or both of them that are at fault. If it's just one of them then I'll try swapping cables between them to isolate the problem further.