Good-news/bad-news is that any kind of FF benefit, they will sell to you now anyways. E+, bags, BG. Upgrades like CPUs are a thing of the past. It’s the end of an era.

If you fly enough (really pay enough) to get Gold, then it starts to make sense to get a credit card to catalyze that for Platinum or 1K. For domestic, couple flights a year, just pay for E+ or even F and drink the difference. For most domestic flight to/from DEN for me, F is nice, but not really a have to.