Why use Linux or not Solaris? Wait... Solaris is not really that relevant anymore.
I actually get your point but I don't think you should frame the differences as a sales pitch. Most probably people interested are engineers looking for some innovation. So the question is not "why use this" but instead "why is this interesting"
When Discord was relatively new they had a comparison table with Skype, TeamSpeak and other platforms. As a long-time TeamSpeak user, I found that very helpful at the time, because it helped me understand what Discord wants to be.
With Stride it is kind of similar. I don't expect an open-source engine to have the same set of features as Unreal, but they should tell me what they think they are good at! Especially in comparison to Godot, which is a direct competitor in the open-source landscape.
The page talks a big game, and makes big claims. So honestly I'm a bit sceptical :/
I actually get your point but I don't think you should frame the differences as a sales pitch. Most probably people interested are engineers looking for some innovation. So the question is not "why use this" but instead "why is this interesting"