The only issue is that the UI isn't as clean because it is so powerful
There are countless applications that are more powerful than VLC that also have cleaner UIs. Power does not precipitate bad UI; bad UI shames power.
There are countless, often hidden, configs on the TV, in Windows, and in graphics card drivers. Even if there exists no config that can solve your issue, that does not mean there is a problem in the HDMI spec. It is VERY LIKELY there is a design flaw in any one (or all) of the following: Your TV, your computer, your graphics card, windows, or your drivers.
The HDMI spec does not differentiate text signals. Text simply exacerbates a lower level filtering issue one of your components is experiencing. This is definitely not, as you originally stated, a problem with the HDMI spec.
I suppose that the HDMI spec might have explicitly disallowed overscan, sharpening filters, resampling, motion compensation, or any of many other filters that could cause these sorts of artifacts. In this regard, yes, the HDMI spec is at fault.
Or how technical people look upon sales, marketing and PR people with disdain, because those people know how to relate to the public
Do marketing and PR people really know how to relate to the public? I find most marketing and PR is a gamble. Countless super-expensive campaigns are utter failures (for a particularly good example, see the Tropicana Packaging debacle, or the recently revealed poor sales of Windows RT tablets). They might be better at relating to the public than technical people, but even the best firms are just throwing darts at a dart board. Some campaigns are great, but most are just lost in a sea of similar monotony or are complete disasters.