Why is in-person better than virtual?

I'm having a hard time explaining this to L. L has a lot of long distance relationships. And she's very secure with herself. So I just don't think she understands why having in-person sessions are so important to me. We've come up with words like "withness" and "presence". There's touch. But it's hard to explain otherwise what the difference is.

I have transitional objects, and we have our own essential oil for "our" smell. We have candies too. I have something of hers and she has something of mine. I still get my sessions and between session support. She's also still a part of my safety plan. I have pictures, and we can do video. She's just in a different state right now. But it makes a huge difference to me!

How do I explain to L why it matters? Does anyone else feel this way and know how to describe what "it" is?