Additionally, the W3C has some private mailing lists, does private working group meetings, and so on. So yeah, the WHATWG is a lot more open when it comes to input.
For all the web platform stuff (I don't know about the semweb and digital publishing side of things), you can basically ignore the existence of the private mailing lists (they get basically no traffic, and people like me start screaming whenever anyone tries to have a technical discussion there). I'd rather they didn't exist, but realistically they're not a barrier to participation.
The F2F meetings and telecons are more problematic (because both are inherently exclusionary, either in time or in travel), but those are at least publicly minuted and any resolution from them can be overturned.
10-15 years we were told that use of <table>s for layout purposes was terribly wrong. Without any reliable alternative mechanism.
Here is my proposal to W3C CSS WG to add flow property and flex units: https://www.terrainformatica.com/w3/flex-layout/flex-layout.... It covers as flexbox as grid features under the same mechanism. Yet it establishes robust framework for other layout methods.
Note it is dated April, 5, 2009. It took us almost 10 years to have something matching that.
So neither W3C process nor WHATWG process is perfect - there is no reliable feedback from customers (web designers) to browser vendors.
What if browser would provide us just abstract DOM with minimal HTML/CSS implementation and some extensibility/plug-ins mechanism with something like Java.
In this case we, the community, can provide better implementations:
main {
flow: HolyGrailLayout(params) url(/layouts/HolyGrail.class);
}
<main>
<header>
<footer>
<aside>
</main>
So instead of waiting for the weather for 10 years we will do something literally tomorrow when we need it.In this case W3C will be able to perfectly fit its role - high-level management of all this.
No one can manage the reality up to need of toilet paper in full. USSR tried and where did it go?
That's what Houdini layout extensions are about, if that work ever comes to fruition that will indeed be a pretty major advance for web design.