It's weird that people want to defend the lack of a playable party so badly... I
personally think XV is missing something integral by not including it. Nobody cares about Donald and Goofy because they're weird cartoon characters in a game series that's been established from the beginning as having one playable character- and that in recent titles has even branched out to multiple playable characters! Meanwhile, you have Final Fantasy XV which has three totally rad dudes with their own slew of powers who would make excellent additions to a playable party. Gladiolus is even canonically strong enough to hold back Titan and Noctis is not superior to his party members in many ways going by in-game stats.
(Image translated by the fantastic
@LeonBlade sorry I'm using it for evil I know you don't agree)
Here we can see that when it comes to raw stats, Noctis actually isn't much of a standout in his party. He's the third strongest in terms of attack power (Prompto even beats him how embarrassing) and he's the very weakest when it comes to defensive power. Thankfully, he's the second toughest in terms of HP but it's pretty clear that the party members can pull their own weight- especially if you've been paying attention to recent footage.