When you go to Bitcoin Core source readme file (
https://github.com/bitcoin/bitcoin )
You will see very early line
What is Bitcoin? Bitcoin is an experimental digital currency that enables instant payments to anyone,
In my opinion, whole word is an experimental.
In that sense, I do not see why
BTCitcoin would need to state itself as an experimental.
It is more than 10 years old. I would just say it is in active development.
It is. You still can lose all your money over night and nobody will bail you out. Most people that invest in crypto are not aware of this. It doesn't necessarily mean a bad thing as long as you don't invest more than you could afford to lose.