Skegness works generally very well and the station staff there are extremely well regarded, which seems to be the opposite to the Blackpool North of the last 50 years
The train arrives, the inbound passengers get off with their piles of stuff, it gets cleaned, and then the guard checks tickets on the gate picking up issues as they arise and the platform staff deal with passenger assistance, help keep the flow of luggage moving to a manageable level and even out the loadings on what are generally insufficiently long trains with plenty of difficult passengers.
It is rather like how the railways in the UK regularly operated at many locations before the BR open stations concept got rid of most station staff and is far more civilised than the St Pancras and Euston scrum - the main difference is that it's a manual ticket check because Skegvegas is most unlikely to ever acquire a gateline
I honestly cannot see any comparison between Skegness loading an hourly under resourced leisure travellers train making a 2 plus hour journey whilst also cleaning it and checking tickets in a relatively orderly fashion with largely friendly and helpful if somewhat frazzled staff and the Blackpool North experience and I'm not sure why they're ever compared as such.
Someone deciding a train is ready for boarding half way through a 5 hour round trip whilst it is unloaded or cleaned isn't exactly unusual in the UK or elsewhere.
If you're suggesting the better alternative is to remove the gates, let the train arrive with the platforms already full and then have a massive free for all on changeover day between 4-500 arriving and departing passengers, all with luggage, "GET A TABLE", 2 wheelchairs on and off, other passenger assists and the cleaners fighting their way through as well and giving up any attempt at protecting revenue if the train is full and standing 3 car 170 then I'm afraid bitter experience tells me that you are most definitely wrong!