It's time for reminders in SharePoint

A few things should be noted, that Microsoft really should clarify. In all these cases the Flows are created with each running daily, counting against your number of Flow runs.

First, it is not clear that making a selection of items/documents in a list/library is pointless. It does not create a reminder for specific items but all items that fit into the criteria you specify. For example, we have a list we use for tracking projects with many date columns for phases and milestones. Selecting to be reminded 1 day before the Phase 5 date will create a Flow that runs every day and will email on you listing all items with a Phase 5 date of the next day (1 day before). For the PMO who wants to get reminders for ALL projects this is a fairly handy tool, but I don't need to be reminded of every project when it hits that qualifying date! There is nothing on this page or the MS support document page that states this, but rather insinuates you can select an item and get a reminder - singular - for just that item when in actuality the action of "Set a reminder" is "Set reminders for all items." 

Secondly, if you do select an item and choose a date where the days before ends up in the past, nothing happens, but it still creates the Flow. I would think you should get some kind of message or email from the Flow that indicates you chose a date in the past. 

Lastly, and most annoying for the use-case we could use this in the most if we could select specific items, this does not work with calculated date columns, even though they will show up as a choice to set a reminder on. We have a calculated Next Milestone date that automatically changes which would be great to get reminders based on the items I select whenever they're close to the next milestone. The result - you will get an email immediately that just says "something failed" with the Flow created which will run every day (sending you the same error email) until you modify it to point to a standard date column or delete the Flow.

I submitted a support ticket based on these findings and spend over an hour on the phone with the support engineer who went from agreeing with me these were issues to telling me they were "by design" and I should suggest changes via UserVoice (aka - the black hole unless hundreds search for the same thing and vote on it). He conveyed that the product team was working to fix the calculated column but still used the "by design" excuse, which is used far too often by every support engineer I've dealt with. It's highly frustrating to find issues and spend valuable time going over them only to be told it's by design and have the ticket closed. 

I would love to communicate this new feature to my users but we don't have any good use cases for setting reminders for all items in a list. I'm also afraid of how many Flows are being created that will run daily by curiosity on what it does.