Hmm. I do agree that Channels are the best way to track successes. But no where in all of the things that you said did you mention straight website pages.
If I had a download behind a form for a white paper, case study, ebook, etc then I would use a channel like content, not website. Under what you described "website" would be like visiting the product page vs the who we are page. If you're talking about advertising, then i think the channel should be advertising, or social media. etc.
At the end of the day, if you aren't talking about revenue, then you're not pushing the conversation to the right thing & declaring your seat at the decision making table. You're just showing that buttons get pushed, but in reality it doesn't mean much.
So please, create all the channels you want, you certainly can. But data for data's sake, isn't a board level report. I never report on opens/clicks as they don't matter.