I flew from HKG to BKK - first business trip in 3 years. Plane was rammed. Multiple nationalities. Lo & behold as boarding time came near a queue snaked its way around the gate area and people boarded pretty much as and when they wanted. I sat down and watched. When I boarded of course the seats by me were already taken & they just had to move so I could take my window seat. I don't know what the rush is - same when we land and everyone wants to get up straight away, though they can't get off anyway.
And people that need assistance boarding should be boarded last not first