I’ve used FaceApp twice when I didn’t have time for makeup. It did a reasonably good job simulating how I look with makeup. Both times I clearly indicated it’s use, and would never do otherwise.
I think it’s okay to use filters. Maybe it’s fantasy. Maybe you’re pressed for time. Maybe you’re looking to improve your makeup skills. Maybe your situation restricts your ability to express yourself.
I would offer that in many situations, being our authentic selves makes the best photos! A smile goes a long way! Beauty is more than skin deep! Use filters with moderation.