Just curious how many people are able to justify a single Amex card as their daily driver and make it work.

Some examples might be:

- Delta Platinum or Delta Reserve to hit $25k (or $30k) for the MQD waiver plus MQM bonuses.
- Amex Platinum for 5x on airfare, 1x on everything else, but additional protections, etc. Perhaps those who value MR points highly.
- Amex Gold to simplify? Perhaps 4x on dining / grocery covers most things where the need for more on other categories isn't a big deal?

I know many use the BBP but mostly asking for personal cards only. Just curious.