When I was checking out early builds of SQL Server 2019, I noticed a new DMV called dm_db_missing_index_group_stats_query, that I thought was pretty cool.
It helped you tie missing index requests to the queries that requested them. Previously, that took a whole lot of heroic effort, or luck.
This has long been a pain point for index-based query tuning. You can guess what the types of queries can look like based on the suggested columns, but one risk of that guessing is that index order matters but the columns get returned in the order in which they exist on the table, not necessarily the order in which they would be most useful.