It's more about the overview for the Owner of the site. In the Attached screenshot you can see if the page is locked without clicking on the page, or opening the page in the Editor. This helps the owner of the website to quickly check the status of each page without clicking/opening the individual page.
In the Touch UI, we noticed that this indicator is missing from the UI (except on the Card View). In the list view, it seems to not show it in the UI, so it requires additional clicks to get that information.
The proposal would be to add this "Lock" icon to the List view so that the Author/Owner would be able to see if the page is locked without clicking on each page.
This has been reported to the engineering under the internal reference SITES-14686. The product team will triage this request to verify feasibility based on the prioritization model. This post will be updated according to the Jira request status.