iPhoto menu -> Provide iPhoto Feedback is the route to the Apple Developers. That's how you reach them, so don't despair. I'm sure they'll love to hear what you have to say. Here you're just talking to other users.
But remember that iPhoto offers built-in uploading to Flickr and Facebook. There is nothing to stop Google from making a plug-in to do the same job. Oh look they did! Perhaps you need to ask yourself why Google have not updated that in several years. Or why they make it so hard to find? I wonder if it might be because Google want you to use their app and not Apple's, or Adobe's or anybody elses.
And you can directly export to Picasa and other cloud solutions. The iPhoto Library is available in every single upload/attach/open dialogue in the entire OS.
Other "popular cloud solutions" create and maintain plug-ins for iPhoto.
Lastly, there is no lock-in. iPhoto is not required. You don't have to use it. It's an opportunity, no more. If something else has the features that you prefer you're perfectly free to use that application.
Just thought I'd mention that before you share your thoughts with Apple.
Regards
TD