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I migrated my author site to SE. If you are still a member, feel free to log in and explore. I had no trouble. I use Groups and it has Discussions (forum).
I use the Atlas theme which is responsive so I don't need mobile app and don't have those fees associated with mobile apps. There are mobile apps available.
I love the control I have in SE, networks are awesome - I use them for genres. With 4.10 coming soon, we'll have hashtags, smileys and more control over networks and profile mapping so it'll be pretty complete.
I don't miss much. My ST main site is PF v3. If you were to use PF, I suggest v3 over v4. Less issues. However, SE has a better setup for CDN and external storage. Honestly, you should ask @Zixia604 as he just migrated a huge community. Perhaps PM him.
@Kirkus I edited what I could of your post to add the code tags but it looks like the rest was stripped. can you please post according to the guidelines with the markdown so the code can be seen and thanks for the details