This is precisely why CEX are more patronized than DEX, because centralized exchanges are more convenient and has cheaper transaction fees for smaller transactions than the decentralized exchanges, as is obvious from the OP unfavorable experience. People are advocating for DEX but with this Uniswap, being a reputable DEX high fees for small transactions it's not helpful, only favorable for big transactions.
You also need to remember that CEX needs your privacy and that will not be in line with people who prioritize privacy, and you do not have full control over your assets, CEX has authority over your assets too. Whereas in DEX your key is your assets, only you have full control and without the need to implement KYC. So this is a choice about privacy and freedom of trading.