Redircting from index.html to /

A 300-page site with many links to pages like this:

example.com/directory/stuff/index.html

Is it worth changing them to:

example.com/directory/stuff/

Should there also be 301 redirects from every /directory/index.html
to /directory/
?

It doesn't have many IBLs, and very little traffic.

Also, in general, on pages where Google has indexed both / and /index.html
is it good to redirect the index.html to /
?