Nah, not too controlling. I know what you mean. The "personal devices" page on Smartthings is a little misleadingly named in my opinion.
The real personal page on Smartthings is the Favourites page. There you can add or remove any device onto your Favourites however you choose.
But the personal devices page, as far as I know, is really just a Smartthings extension of the Android Device Control nav menu. Which is something only Google can give more custom options on in the future, not Samsung. Hopefully they do in the near future, because I'd like to keep the Device Control menu clean, myself. I don't need every bluetooth speaker I've paired with my Samsungs listed when I can't even control them from Smartthings anyway.