I think a lot of this comes down to what your expectations are of a genre/show. Most people watch BL for just that a relationship between to "Boys" with some degree of "love/intimacy". Now does a show have to have KP/TharnType/Dont Say No levels of NC scenes.....absolutely not. But it is frustrating when shows tease or hype up a more intimate relationship but then dont actually deliver that.
2gether for me is a perfect example of this. The very first thing Bright says is I will kiss you until you drop! The show is straight away setting expectations of a level of intimacy that they do not deliver on. They play on the expectation time and time again. So it becomes frustrating that when they finally do become a couple it seems odd that they are not more physically intimate (again just a few kisses would have gone far). if the show had set the viewers expectation at a more bromance/no intimacy level i think people would have liked it more.
Tale of a thousand stars is another show that for me personally played up the promise of a physical relationship but never delivered and then expected me to believe that these 2 people were willing to commit themselves to wait for each other for an unspecified number of years without even a single kiss? That is counter to the type of relationship story they had been telling the entire series. hence I found it a bit disappointing.
On the flip side you have these 2 shows
Untamed is a great example of not needing any physical intimacy but still being a BL that people obsess over because of how good the chemistry and relationship are. Even if you didnt know it was a China Censored show, from the outset the show never leads you on to thinking there is going to be physical intimacy. Instead it shows the power of love in a relationship.
Light on Me another series i really like that has one kiss in it and thats totally fine because the show never leads you to expect anything more than that. It is about the emotional growth of the characters and i ate it up!