This reminds me of using Pi = 3. I remember a YouTuber using it in a calculation to antagonize the audience a little bit. The thing is, any number you can come up with to represent Pi, isn’t Pi. You have approximations which are accurate enough or not for the application in front of you. If you get correct conclusions with only one digit of Pi, then 3 is a sufficiently accurate approximation for what you’re up to. But someone else might need fifteen digits…