I always got the sense that Lando only worked with the Empire because he was forced to; "They arrived just before you did". He then betrayed them at the earliest opportunity and never did anything for their side afterwards. Yeah you can make the argument that Tibana Gas was being sold to both sides but that in itself wasn't really shown.

I still agree that the older trilogies did a MUCH better job at exploring their ideas. The sequel trilogy really felt like they just wanted to make audiences giddy by referencing the older properties first. Everything else--characters, story structure, dialogue, any potential deeper meanings or staying power, etc--were all put on the back burner just to try to get the most amount of laughter and applause during opening night