It reads as though they knew he was way past his best but they were willing to keep him around and keep paying him due to his service. I’m not sure they did much wrong. But he’s clearly an ambitious guy.
I like the role he has in AEW currently but he should never ever be main eventing
If you were the size of Big Show and used to having the incentive of a main event now and again purely due to how you look, wouldn't you think its a waste to be fed to NXT guys to get them over?
Just due to his size and his name/accomplishments he can be someone that the stars beat before they are going to the pay per view and going for the big belt. The visual and easy story of beating the biggest giant in the business to mark that on a contenders cv. Especially if the title match is going to be against someone who isnt that big. Then having beat Big Show and then beat Daniel Bryan for the title or whatever, theres no question about "yeah but can he beat one of the biggest guys", which if this were real and storyline is supposed to be "real" would be one of the obvious question marks. I mean look at Fedor's MMA career - theres always curiousity and fascination about a smaller guy taking on the big guys. Thats how he made his money.
El Gigante is considered one of the biggest dissappointments and he had some big matches just due to his huge size.
Big Show is obviously past his best. So are a lot of the guys in WWE, AEW, NJPW. Wrestling is somewhere older guys can be protected and last longer than if it was real fighting or sports.
Now, unless he had a new gimmick or character or a really cool storyline I cannot say I'd be excited to see him in a main event for a pay per view. When you've been around as long as he had been and done as much as he had done obviously over time you want to see new guys in the top spots. But its easier said than done and WWE have had trouble replacing him with someone else. I think we can say in the past couple of years that Braun is now that guy and can do what Big Show did. A couple of inches smaller but in better physical shape and age, and working against smaller main eventers than Big Show used to
Considering theres 2 main brands, is there still a spot available for a giant guy? You would think so, but maybe Drew McIntyre and Damien Priest at 6'5 are now considered giant enough for that spot even though they're another few inches smaller than Braun.
So from Big Show's perspective I can see why he would want more than just putting over the guys who come up from NXT, I think he could still play his role due to his size but at the same time WWE probably have tall enough guys to tell the big guy small guy story a billion times without him and with new people it will always seem more fresh. So I can also see why WWE would want to give new guys those kinds of spots. I complain about WWE not making or pushing people into those new star spots, but this is an example where they clearly have tried to do that and I think its hard for a neutral to feel like they're getting it wrong.
Edit - Edge would be another one same size as Drew and Priest