Is isolated languages better for Auxlangs?

Isolated languages are really easier to learn and better for an auxlang,
and some large languages (for example, English, Chinese(all dialects),
...) are isolated (Chinese) or partially isolated (English). But someone
told me

> Simon2 says:
> If you use isolated languages, you will be isolated from the world.
So are isolated languages better for auxlangs?

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