I had this question related to the redirect buttons. Some apps or websites need time to save data before making a redirect or load some content. Usually, action from the user can't help. In these actions, a loader or a progress bar helps the user see the progress. I was wondering if a "redirect" or a "refresh" button really has benefits.
I realized it is the same case for the "save" buttons because most apps auto-saves everything and I read this interesting answer for the question "Why don't we auto-save for users instead of having them save manually?":
In Marketo, the app auto-saves everything. We have very few "Save" actions.
However, interesting side-effect. In the email editor, some users were so panicked that there was no "Save and close" button, that we added one.
All these articles and questions have some good arguments to use placebo buttons, but all the studies I found are from 2-6 years ago. In the last years, people use a lot of apps with autosave or other automated actions.
A placebo button is one more element on the screen and can be replaced with an "info" message, but this will be enough? What do you think?
What are the best practices, in this case, to keep the UI familiar and give to the user the illusion of control or to keep it simple?