There is a whole world of difference. Figma's servers can be down when you need it to work, developers might want to 'phase out' the function you need, or introduce some changes that would totally break your workflow, and you will be absolutely powerless to do anything about it but conform.
With locally running app you control when and where the app works, and you have way more options when developer introduces some changes that don't fit you.
With locally running app you control when and where the app works, and you have way more options when developer introduces some changes that don't fit you.