No, dynamic type systems are not inherently more open
Internet debates about typing disciplines continue to be plagued by a pervasive myth that dynamic type systems are inherently better at modeling "open world" domains. The argument usually goes like this: the goal of static typing is to pin everything down as much as possible, but in the real world, that just isn't practical.
https://lexi-lambda.github.io/blog/2020/01/19/no-dynamic-type-systems-are-not-inherently-more-open/