I believe they are significant because they enable our transactions, hold our assets, and assist us in investing in a more simpler manner through their software, and I believe they are functional in many other ways.
The main use of exchangers are simply making users do able to make buy and sell in between different coins that been offered and the best thing is that you could make out conversion of your
coins or crypto into fiat which i do believe that this is the main reason of their existence or main usage or purpose which we could tell that it is really that convenient but of course it
do really oppose out total decentralization because it would really be dealing up with some centralized and regulated thing which its not a surprise.
Its important on the ecosystem but people should mind about the risk most of the time.