To each their own, but I'd rather neither of those things at the expense of not being able to select "Home", "My Account", "Settings", etc. Shit that nobody actually needs to select anyway.
Do you have an example of a website where selectable text makes keyboard navigation not possible? Could this be a browser problem?
I can tab between links here in HN and it's perfectly also selectable.
Alternatively, set your cursor at the end of the header in the empty space, and drag your mouse backward to highlight the items. At that point, you can highlight the text, because you started in a non-user-select-limited area.
Note that this is default browser behavior. Inspect the styles and see that they have applied no selection styling to those anchors. This is the thing I'm advocating for. Make the web work like the web works, and disregard people telling you that "everything must be selectable" not because it shouldn't be, but because there are features that expect certain functionality to work well with the other features of the web.
Not translating entire articles to a language you don't support has the easy remedy of letting people select the text and use third party tools to support their specific use-cases. But not including translations for your clickable content for languages that aren't supported are the literal practical limits of ability. I would rather my apps work for people in languages I do support, with full accessibility (and minimal scripting overhead), than to have them work poorly for keyboard-only users in all languages, regardless of my app's support for them.
Again, we're talking about the stuff that should be iconic. Things that can literally be represented by icons. Buttons and tab headings. Things that you shouldn't actually need translated AT ALL, much less into every single language there is.
Also if you're a non native speaker you want to be able to select the text so you can translate it
And, more pertinently, why should I support it, at the expense of keyboard-only users?