As a Roblox developer, it is currently too hard/impossible to remove a specific item from a MemoryStoreQueue.
Currently the only way to remove an item from a MemoryStoreQueue is to remove it with a range of items using the string identifier returned by MemoryStoreQueue:ReadAsync(). This increases the likelihood that unimportant items later have to be processed as such. The strongest case for this in my mind right now is matchmaking, which is a case that memory stores are meant to cover.
When a player is added to a matchmaking queue, the only way to remove them from that queue right now is by doing so later when a server processes them. Sadly, there’s no quick and efficient way for any server but the server the player is in to understand if that player is still available. Players may become unavailable for a number of reasons, such as cancelling the join process themselves or leaving the game. In which case, it would be very useful to be able to remove them from the queue then and there.
The only way around this currently is by having the server the available queued players arrive in decide by some arbitrary logic that the queued player who left/cancelled is no longer going to land, and then pulling a new player in making the available players wait longer for their game to start.
If Roblox is able to address this issue, it would improve my development experience because it would allow me more control over my queues and the items I consider to be available or not.