personally i can't really use desktop clients anymore. it's super weird if you need to "quickly" check your email somewhere else and all your setup is different.
I only access my email on trusted devices. All of my trusted devices have IMAP clients on them. I can see that webmail is useful for people who are willing to access their email on untrusted devices (a friends computer etc) which wont have email clients pre-configured, but I'm not one of those people.
personally i can't really use desktop clients anymore. it's super weird if you need to "quickly" check your email somewhere else and all your setup is different.