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You can schedule two jabs at your pharmacy, so it isn't that inconvenient. It is much harder with a young child, who...you can get to take one jab but you really aren't going to get two jabs in one sitting. A combined jab would avoid an extra appointment and toy/cheeseburger bribe.

Also, the COVID jab is much harder to take than the flu jab for some reason. I barely notice the flu shot, but for a COVID shot, I actually feel my muscles contracting, and my arm is a bit sore for a week (although nothing beyond a minor annoyance). I wonder what this means for a combined shot.

You can get two or three vaccinations at once provided they don't have any issues with each other. I just got Shingrix and TDAP earlier this week, one in each arm. Pro tip, get the one more likely to cause injection site pain (Shingrix in my case) in your non-dominant arm.

and moderna: https://www.nature.com/articles/d41586-024-02121-1