Like you, I thought the exact same thing. I waited 6 months to finally make my decision and after driving around for 6 months here are my thoughts:
1. I felt like a fishbowl the whole time, everyone could see me
2. I didn't like the fact that someone could see me since I like to launch the car a lot, I like to be in incognito
Since getting my car tinted:
1. It has look sportier
2. I'm loving the privacy
3. It feels more like I'm more in a bat mobile.
Yes, the white interior is beautiful and I like to show it off but it comes with trade offs (privacy). After getting my car tinted, I realize you can still see the white seats through the front window so if you like the 'show off' factor, it's still seeable.
Depends on why you want to get tint but you want to go about 10% darker since you have white seats. I went with 15% Llumar CIR which I thought I'd never get because 30% has always been the popular choice. It turns out 30% is still very light on a sunny day and people could still see you. Looking back now, 15% was the best choice.
If you want it to be sporty, get 15% or 20% (my local tint shop didn't have 20%).
I looked up every picture I can of Tesla Model 3 15% tint online and the pictures do not do it justice one bit because it's so one dimensional. When you see it in person it is so beautiful.
Again, everyone gets tint for different reasons, you just have to decide what you want more.
Here is the thread I started back in December:
Anyone have White Interior with tint?
as you can see 30% looks great, but it's very deceiving base on the angle and lighting it was taken in. I wanted my tint to still be dark on a sunny day which people can still see you but not very clearly.