Input is good, it's all about tone.
You can close the help banners by clicking the "x" on the right side. Once closed they don't come back. there's a balance between making sure people see those and being annoying.
The ads aren't sticky, and you should be able to scroll past them easily. We have tried to shut down all the slimy ad categories, so if you saw one that looks suspect let me know and we'll either kill the ad of the category it comes from. And, if you login and check the Remember Me box you shouldn't have to login for a long time, or be bothered by ads.
I don't think I've written a post long enough to get past the text box. I may be able to make that larger. I suspect the condition you're describing is browser/ios-specific but I'm not up on that stuff enough to know for sure.
Let me know if you remember anything about an objectionable ad, we don't want any of that garbage here.