Photoshop: My "select subject" experience is very slow/poor

Please excuse me tagging onto an existing thread, but over at 
https://forums.adobe.com/thread/2442036
a user describes that they are lacking the feature altogether after updating and screenshots seem to support the claim. 
Do you know whether there are known issues that would be able to cause this?  

That customer does not have an active membership. I suspect he's using a crack of a build without the feature.

Thanks!
I would not have thought of such an issue ... 

thank you hanna. here is the pasted information:
https://drive.google.com/file/d/1auDQE1WXsA9-r9B1BxENNYOC7Z_bxddb/view?usp=drivesdk

Well my membership is active and I agree the select subject feature is pretty weak. Also there is no mention in help so .. you don't know if you are doing something wrong or it's just a half baked  function.  I get much better results with the select and mask tool even if it does take a few more clicks.   

Hi Mike, Select Subject isn't designed to make a perfect selection. It's designed to quickly make a rough selection of the subject(s) in your image for furtherl refinement with Select and Mask.

thank you Jeffery, this feature has the potential to help ease the process but as long as it is fast enough. the issue reported in the initial post is speed, not accuracy. I am not sure what Mike means when he writes "pretty weak" and "better results" if it's in regard to speed or accuracy. 

Right, I was addressing the actual results. We still need to figure out why your results are slow.

Sorry. Perhaps I just expected more from the various write ups I've seen.  In every case  I've tried it out on it's only selected  a portion of what ever  part of the image I was looking to select. And the fit was not  great.  It  just didnt seem to be ready to really save me any time or effort in my work.  Im betting it will get better as  time goes on, but  nothing about it at this point makes it  m think "Ah ha! This will be much easier if I use the subject select tool".  if I have to go in and refine a selection by hand  after using the tool I would more likely use something like the select and mask to get me closer to what I need. 

How many different images did you try? It's a bit like content aware fill. You may find works brilliantly in many cases, but fail epically in some cases.

Several. Ranging from a solid image of a tv stand on a white background ( selected half of the stand ) to various other outdoor images like men doing construction outside. Funny that all three men had bright green tshirts  on that I would expect to at least be selected and it selected  only half of one man. And if you try to select an additional man it cancels the first selection.  Also tried to select a large work truck  from a lighter background ( dirt ) and it just selected a part of the truck and not well.  So I did try it across a range of images.  It just seems not quite done.  I will keep trying on occasion.  So far I've seen only the epic fails : )  But, like i said I will keep tying on occasion ; ) 

There should be a way for "select subject" to select one subject even if there are several. It would be better if you clicked "select subject" and then clicked on the subject you actually want to select. Shift click if you want an additional subject selected. 
I agree with others that it is very slow. I do overall, however, like it.