My ethos hasn't altered a bit since 1995 when I built my first proper website.
Find out the reason for living, the reason the website exists, and then, at EVERY decision, ask yourself the simple question "is this moving the visitor to my/their goal?" If it isn't, it gets thrown away.
There is an old saying and that is 'you can only sell one thing at a time', this is why the up-sell exists, get the sale THEN sell the second item, as selling more than one thing at a time is difficult.
In a different life we had a team of 30 sales people, some telesales, some field sales. crossing over was a nightmare why> because they were selling different things.
Let me give you an example.
An Email, the content depends on what IT is meant to be selling.
If you intend calling the potential client as a follow up call, then THAT is what the email sells, it doesn't sell the product, it doesn't inform the prospect about the product etc, it ONLY sells the follow up call. e.g. I would like to introduce myself to you as I have something that I believe will be of interest and will benefit your business, I will call you tomorrow (Tuesday), when I can explain better, and, if it interests you, arrange a follow up to give you more information.
Too many people try to sell the product when they should be selling the call. When you make the call, you then sell the next step (be it face to face meeting etc). If at this point (the follow up call) you are intending closing the prospect THEN and ONLY then do you sell the product.
The same should be true of a website, if the page doesn't help in getting to the goal, then it shouldn't even be there. If an element doesn't help lead to a close of some kind, then again, that element has no right to be there as it is a distraction. YES it may entertain the prospect, but if it is all flashy they may well end up enjoying that and be completely taken away from the search expectancy they had when they landed. i.e. YOU HAVE FAILED!
I used a term there search expectancy, THAT is the key to internet marketing. research the keywords, and consider the search expectancy of those visitors. then give them what they want to help them to your/their goal.