Rick going Rambo on people when he is obviously outmatched is the definition of going against character development and chasing a cool moment. They're trying to hammer in the idea that Rick is very fucked. Have you been paying attention to the show? They've even discussed it among themselves, they're good at taking people down. That's why they decided to chase after Negan's group in the first place. The show is building up the concept that this isn't Terminus or The Governor. These people can't be taken down with a group of untrained suburbanites. Not to mention that most of Rick's key people aren't even there.
Rick going after Negan now, when he is in an even worse position than he was the first time he tried is such a dumb idea. It makes no sense. They got fucked the first time they tried, how would it go better when he has fewer people, and Negan is most likely prepared for it. The entire season finale was about showing how outlcassed Rick's group was. Rick and his people murdered the Saviors in their sleep. Even if Negan died, the other Saviors aren't going to let that slide. They have more weapons, more people, are more organized, and have more fighters. Why would they even consider letting Rick's group endanger them? Even if Negan didn't exist, Rick's group is a danger. They have a purpose...provide. Otherwise they're dead.