PTS is dead. It makes no sense to sharedrop on an outdated prototype system that people still have large hoards of. PTS holders have been given a sharedrop and a snapshot on the 5th for BTS distribution.
If I was a 3rd party developer I would want my application to be used by as many people as possible so I would distribute it on BTS as it has a larger userbase and my shares would not be held by just a few individuals who have hoards of PTS.
There once was a time when everyone who was involved in bitshares had PTS and/or AGS, and to sharedrop to them was to sharedrop to the whole bitshares community.
Now, much of the community still has PTS/AGS, but there are many newcomers as well who are mostly in BTS.
In the future as bitshares grow, this later category will grow, and more and more will just have BTS.
It is up to developers to chosoe their target group correctly. Do they want to try to get buyin of the whole bitshares community, by sharedropping BTS? Or do they want to specifically target early adopters, by sharedropping PTS/AGS?
This is a decision they must make, and depending on the project, I think either one could be the correct decision. If you are looking to get the widespread community to start using your product, you might sharedrop BTS. If you are just looking for a small group to start building your technology, you could go with PTS and try to get more core supporters.
(Or you could also sharedrop both!)
In the end, it is new project developers that will decide what to do with their projects. I hope that these developers will make intelligent decisions based on the goals they want to achieve with the sharedrop.