When I was on Verizon before they were sold to Frontier, competing networks would schedule shows to start several minutes before the top of the hour or running a few minutes past the hour and these times would show up in the grid. This would cause conflicts when the overlap was only a few minutes.
Their DVR had early & late start and stop times. Early and late start times were a matter of minutes. Early stop times were a matter of minutes while stop times could be a few minutes to several hours late. You could adjust the start and stop times on a conflict screen to resolve the conflicts and allow programs overlapping by minutes to be recorded.
I have not had this problem with Tablo but I think the overlapping times are handled by the providers of the Guide and rounded to the hour. On the Tablo, I do have some shows where I miss a few seconds of the start of a show. I don’t have an issue with rounding the time to the hour or half hour. Having those minute start and stop times in the grid caused weekly work to resove conflicts and not miss a recording. These few missing seconds of a show that started early are rarely important. I appeciate the new option to extend the stop time to allow for time shifting for live events that can force some shows to start up to several hours later. If a more precise timing is necessary then I think we can schedule recordings manually.