The test tab is great in the workshop. I use it after soldering strings together to make sure I didn't screw something up in in the assembly. I never (seldom) use it for the display once it is up as I use the a sequence or the FPP display testing. I also use it for counting lights on a string. I have created and saved a setup in test that lights up only every 10th bulb. Much easier to count the lit lights and whatever is left over to determine how many nodes are on a string that has been cut off last year. Also use it to make it faster to cut new strings off. I have a lot of props with 60 nodes. Put a connector on the input end, load a 60 count setup, turn it on, and you know where to cut that new 100 count string apart. Also good for testing the configuration of hardware to ensure you have the channel assignment correct before you take it out to the yard. You can you do all this with a sequence. but why bother to create, save and clutter up my folder with unique one time use sequences.
Just some of the many ways I find the test tab useful. YMMV
