Whether you use a specific wallet to hold your Bitcoin is entirely up to you. You can also use an exchange account or use an exchange wallet, it is also entirely up to you.
You should not advise beginners to keep their assets on exchanges. If you advise someone to buy Bitcoin, you should also tell them the safest way to store it.
You certainly know that exchanges are not a place to store assets. You can leave your assets there, but you certainly know the risks. If you are sure to buy Bitcoin for investment, then study some recommended wallets and own one of them.