Their concept of time travel is definitely unorthodox compared to other time travel movies. One of the main characters literally said not to think too much about it.

Everything else was pretty much explained by the protag.

He did mentioned that his line of work doesn't attract forward thinking people. This is quite realistic, I mean, have you seen how a lot of people (and companies) sacrificed long term benefits for short ter ones? It's also posible that they think they can beat that system.

Their future selves are killed to tie up loose ends. The change in power dynamic with Rainmaker's takeover definitely plays a role. This is actually a common trope in crime dramas (and probably also in real world).

It definitely is not a perfect movie, but it's a damn good one to me. I definitely think Joseph-Gorden Lewitt and Emily Blunt lack chemistry, and the sex scene was forced, but I guess it's somewhat realistic someone living in a farm out of nowhere all by themselves can get so horny...