Editing default-widgets.php… Is it worth it?

Question

WordPress

I bring to mind my blozhek on WP.
Is it worth adding style classes directly to default-widgets.php or is it fraught with problems? To be honest, I don't want to complicate things. BUT I have a vague idea that perhaps the simplest solution != the best.

Answer 1

And when a new version is released, what will you do? It is not recommended to pick the CMS engine, the consequences are unknown.

Answer 2

No, modifying WP system files is highly discouraged.
it is more correct to create new widgets and connect them via functions.php inside the theme.

Answer 3

Better as a separate plugin so that even when you change the theme, your widgets do not break.