It is fundamentally different because when I track and email I know who I'm tracking and I will look at the data on and individual basis. For instance "great, t

It is fundamentally different because when I track and email I know who I'm tracking and I will look at the data on and individual basis. For instance "great, that client has opened my contract email 5 times. Means they are interested.I can adapt my negotiating position based on that". For websites I would look as the data in aggregate. Sure that aggregation can be pretty precise but still it is not on the personal level. I suppose technically speaking you could checks the individual use of a website for logged in users but even Google Analytics is very explicit on hat not being OK for instance, and there is no UI for it in any tool that I know.