I will give a few examples just so that we can get the point well. The people who really loved and advocated for Newspapers may have found it difficult to really accept that a new technology that is the news blogs online were taking over. Also the advocates for use of VHS tapes, CD's and DVDs accepting that their technology is phasing out and being replaced by the Movie streams like Netflix, prime video etc. This also applies to investment, People who loved a certain kind of investment are yet to accept that investing in bitcoins is becoming better than most traditional investments.
The trend in the use of inventions are mainly determined by the age of the users. Hardcopy newspapers still exists but they are mainly used by people who are fifty years and above. Some of them might have accepted online versions but others still fancy the physical ones. I know an uncle who still subscribe to daily delivery of hardcopy newspapers.
Cryptocurrencies are mainly accepted by the young generation while the elderly are still sceptical because they are not conversant with the new invention. They will always choose to invest in traditional assets since it is what they are used to.
New technology or innovations are not easily accepted, when that is understood especially when you are an advocate for the technology about to be replaced, you will not criticize those who are yet to accept bitcoin. How well do you think the bitcoin community will accept a new technology that will replace bitcoin? Are we not just going to become the same critics of that new technology even if it offers better opportunities like some people remain critics of investing in bitcoin till today.
I spoke with some young relative about cryptos and was surprised that most if them know nothing about the industry. There is no need to criticize people who are ignorant about how Bitcoin works. But it because annoying when they begin to spread lies and misconceptions about Bitcoin. It is better to learn about a new technology or shut up if you don't know much about the invention.
Anyway, Bitcoin is not designed to replace fiat but to serve as a reliable alternative.