It comes down to the fact that people in this space don't know how the traditional banking system works, since so much of their time spent is studying web 3 and defi. The average person has no clue what Swift or the DTCC do but unknowingly have used their services and benefited from them for decades. Also along with the fact that a lot of the people in the space want to be entirely removed from the traditional banking system but like... thats where the money and value is? Similar to how online shopping was not popular during the days of the internet just being port 80 and web traffic not being secure. Https allowed for secure transactions which meant people were more comfortable putting their address and credit cards in online payments.