Cryptocurrencies are getting high popularity since the witness of rise in bitcoin, altcoins values. The number of crypto traders is increasing along with growth of cryptocurrencies. Mostly, crypto traders' choice was decentralized exchange platforms rather than centralized exchange, since they offer tremendous advantages by cutting down the drawbacks in centralized exchanges.
While i also very much like the fact, that they are so much DEXes out there now becaues nowadays new project don't need to pay horrendous listing fees anymore just in order to get listed on a somewhat reputable centralized exchange, i don't really think that the advantages that you have listed are really all true for decentralized exchanges. Especially "high speed transactions" and "reduced transaction fees". I mean if you already have funds on a centralized exchanges and you just want to trade them for another coin or token that is also listed on that same exchange then you don't need to pay any transaction fee at all which makes the centralized exchange way cheaper in this case, at least on the ETH network.