If the column you are trying to delete is used in a formula then you see a message

Arundhati

If the row or column I am trying to delete is used in another sheet or referenced in a formula within the same sheet then I want to see a message pop up saying the same. This will prevent other sheets, reports, dashboards from getting messed up without me having to manually track all my references.

Amber Eakin

YES, PLEASE! I was just coming to suggest this. I get a notification if deleting a column affects the conditional formatting. That's so minor compared to messing up formulas or references.