I have a Phalaenopsis that's been putting out aerial roots everywhere for a few months now - from the stem and even from the sides of the pot. I'm wondering if it's a sign that it's suffering from humidity issues or if it's just a normal thing. Should I do something to get them back into the soil or just leave them as they are?
Don't try to force them into the substrate, you'll just risk damaging them. Aerial roots are completely normal on a Phalaenopsis, especially if your environment is humid enough - the plant produces them to absorb moisture and oxygen from the air, it's just its natural behavior. If you want, you can mist them occasionally because they'll be happier that way, or you can just leave them alone, the plant won't suffer. The only situation where you should worry is if the substrate in the pot is constantly soggy or rotting - then yes, you've got a drainage problem, not a moisture deficiency.
Aerial roots are completely normal in Phalaenopsis and it's not a sign of distress! Your orchid is simply doing what it would do in nature, where these plants live on trees and develop roots that are exposed to the air. If they're sprouting everywhere, it's actually a good sign that the humidity is decent and the plant is doing well. Leave them where they are - there's no point forcing them into the pot, and you'll only risk stressing the plant and creating wounds.
What you can do instead is help their function! Aerial roots absorb moisture and oxygen from the air, so if you mist the plant regularly or wipe them down with a damp cloth every now and then, your orchid will actually use them and they'll grow more robust. A trick that a lot of people don't use is wrapping the aerial roots with wet sphagnum moss (like tying it around with an elastic band) for a few weeks - the plant will use them to absorb water and nutrients directly, and they'll become even stronger. It's not mandatory though, it's more just to help your plant do even better!
The only situation where it's worth intervening is if the pot is really too large compared to the plant, because then it can't dry out properly and the risk of rot increases. But if the repotting is recent and the drainage is good, you can relax!
Your Phalaenopsis is doing great, it's just the natural behavior of these orchids when they find an environment with decent humidity. One trick I haven't seen mentioned: instead of letting them dangle in the air, try gently guiding them toward the substrate using soft cotton threads tied to the pot, so the root touches the bark without being forced and if it wants to, it can take root on its own. If you don't want to touch them though, it doesn't matter at all, the plant grows fine that way too - aerial roots actually help absorption in a humid environment, so it's a bonus.
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