Having less buttons doesn't mean a job has to be too simplistic, it really depends on how the job is designed. Unfortunately most jobs in FF14 come down to memorizing a string actions you press in a certain order without changing a whole lot. I don't find 1-2-3 combos or using a skill that only does damage once a minute very fun and engaging. Adding some RNG into the mix would do a lot of good to a number of jobs. I think Red Mage is a good example of how a job should be designed as you need to pay attention to procs and job gauge to maximize damage. I know some people like to look at absolute extremes and will be like "What if my RNG is so bad nothing ever procs so I do low damage?!!?!" but that's an extremely unlikely occurrence for a 10 minute fight.

Personally I think World of Warcraft actually did this quite well. None of the classes needed more than 15 skills on your hotbars, yet if you wanted to be a good player you had to know how your small number abilities worked and when you needed prioritize using something over something else. There were no 1-2-3 combos, and while you might sometimes have to hit your filler ability 2-3 times in a row, that was typically because you were waiting for better abilities to come off cooldown or hoping a buff proc'd that allowed you to use something better. This is also a game that promoted the use of damage meters and DPS logs, so everyone knew you you were bad at your class if you consistently showed doing 20-30% less damage than other players.

The whole two minute meta also needs to go.