Not all of your crypto belongs in the same place
Self-custody is not a religion, it is a decision about risk. Most people who hold crypto sensibly use all three of these at once, and move money between them as circumstances change.
An exchange account
Convenient and familiar, and the keys are not yours. Fine while you are actively trading, wrong for money you plan to hold for years.
A phone wallet
Keys on a device that is online all day, in a pocket that gets lost and left in taxis. Good for spending money, exposed to every app you install.
A hardware wallet
Keys generated and kept offline. An hour of setup buys protection from almost every attack that actually costs people money.