Should page files always be server side component or can be client side?

[old flume]

I am currently building a web app and I got an error saying that I cannot use await on params because the function isn't async. But then on making the default export function async, I get an error saying that client components do not support async which then makes me believe that I should convert this to a server component. Anyway long story short - do page files need to be server components only?

[boreal geyser]

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[faint mist]

They don't need to be but it's an antipattern if they are not server components.

Doing so you're opting out of pretty much all app router and RSC features.