Lots of things have happened for years and the improvement and development of Bitcoin as a currency is too visible and I must agree that it isn't in the early adoption period anymore. Some countries are now adopting it as an alternative and digital currency and are being used in digital transactions which only means that it has passed the tests of time so it's already on the higher step pf adoption period.
Even though it's like that, I think for now we are in a transition period where to say we are living in an advanced stage of adoption is not true because if we look at the population, the number of people and countries that adopt bitcoin is still very small.
maybe for people or investors who have long been able to say this is a continued adoption and not an early stage but overall if we look at the actual comparison we are still not free from early adoption considering there are still many people who don't even know what bitcoin is and like how it works.