Hektor Here are some thoughts on the Epic document, question by question. I would recommend going full FAQ with this, phrasing every entry as a question. For example, the first entry's title would be something like "It's just another icon, what's the problem?" Anyway, let's go
It's just another icon
On top of what you already wrote I would add that there are multiple issues with Epic's strategy. First and foremost for many people is the issue of Epic using tactics that go against the nature of the PC as an open and customer-friendly platform. Second is the issue that Epic is making aggressive moves to actively limit or completely shut out competition from many other stores besides Steam. Third is the undeniable fact that Epic's launcher is lagging far behind the competition in terms of features and policies.
Valve exclusives
Nothing to add, you already completely covered this.
Valve first party
Same, thoroughly covered.
Exclusive deals on console
We need to be careful about this because some console gamers are a bit touchy and they might consider this explained difference between console and PC as a "PC master race vs console peasants" thing. I would suggest that we focus instead on the fact that Epic's moneyhatting is similar to the Microsoft Tomb Raider situation that many console players were also very angry at. Epic isn't paying money to create something new and bring it to market, instead they're paying to remove a game that was already coming to multiple other storefronts and create fake 'value' for their inferior platform.
Valve needs competition
Perfect.
Epic can't compete on features
In addition to what you already wrote, I would write that Epic has completely neglected to bring anything new to market and introduce unique features that could draw people in even if the store was lacking in other things. For instance, GOG is offering DRM-free games and they do work to ensure that old games run properly on modern systems. Uplay has its point system that gives various rewards to customers. Green Man Gaming used to allow the resale of digital games. Humble Bundle, Fanatical, Indie Gala and others are doing bundles, Origin offers the EA access service, Epic's Game Store offers absolutely nothing.
Epic will have features soon
I would add that Valve has been doing work that improves the PC gaming platform as a whole, not just Steam. Stuff like Steam Input and Steam Proton, even Steam Big Picture Mode, are way beyond anyone else has ever attempted in the PC space. Even if Epic adds features over time, there is no indication that they have bigger plans for the platform.
Epic moneyhatting
I would add the admission from the Satisfactory developers as well as Julian Gollop's quote that they were paid in advance for a guaranteed number of minimum sales.
Trickle-down Sweeneynomics
I would point out the obvious oxymoron in defending Epic's policies by simultaneously using the argument that "developers get more money and that's a good thing" AND the argument that "developers will pass on the savings to customers". Both can't happen at the same time. I would also point out again that Epic cutting out competition from other storefronts actually increased prices for these games since retailers are unable to offer discounts from their own cut.
Key resellers
Nothing to add, very well put.
The rest of the questions are also important. I would add at least one more, the dreaded "competition is good" and explain that competition is actually good when it is customer-focused and results in better products and services for customers. Corporate competition is not only irrelevant to customers but it can also damage the platform itself. Also, we should mention the fact that Epic's 12% cut is razor-thin and perhaps not sustainable in the long run. No need to reference retail cards, Sweeney already admitted that using some payment methods puts Epic in the red.