Hi  adi_mapcreator, 
I’ve connected the barrier=wall with highway=service as connectivity is somehow visible in Bing Aerial Imagery giving us hints that there is some entrance from the main highway and leading road to access the inside houses. This will also help us to avoid the JOSM Validation error i,e Crossing barrier/highway which appeared to have been generated by your edits and seems it was not not highlighted in ID Editor.

In Order to answer your question, I agree with your point and it's difficult to judge from imagery whether there is a barrier present or not but when you will analyze the data, this is the only entrance to access those north side buildings(house no-95/2) which is accessible from Soi Prasat Suk and that is the reason I didn't add any barrier tag but intersected the highway as per guidelines. I hope this answers your questions satisfactorily?

For your information I am using the JOSM Tool which is more advanced than the ID editor and you will get by default validation errors for such type of edits which we cant ignore.  Happy Mapping!