Again though, do you get a great designer (of the non-technical sort) by having them write 15,000 words about it or would their time be better spent learning as an apprentice?
It sounds as though you think that in order to be academic, a design degree involves only it mainly writing essays about design. That's not the case, any more than, say, a chemistry degree would involve mainly writing essays about chemists rather than being in the lab. Degrees in design - as with other practical arts subjects - mainly involve producing your own work. 'Academic rigour' does not have to mean 'writing essays and sitting exams'.
And the thing with apprenticeships is that they're likely to be quite specific, because on-the-job study is inevitably shaped quite a bit by the specific work environment you're working in. People embarking on a route to practical arts degrees are often still exploring what route to take within that broader subject, and university study allows gradual specialisation as you start to discover where your strengths and interests lie. Often a lot of the specialisms you might pursue involve access to equipment and materials you aren't likely to have encountered at home or school (or, not to anything like the same extent), so knowing in advance that this area of practice is the one for you is difficult.
My first degree was in Fine Art, and the route to that was first through a very broad A-Level, then on to Foundation Art - which I went into wondering if I'd maybe go towards textiles, and came out of knowing that Fine Art was the right direction for me. Then on to a degree programme that my tutors and I identified would suit me well because if it's breadth, which started with an exploratory first year trying out fine art painting, printmaking, sculpture, textiles, photography and media arts, before starting to move in a more specialist direction (although I still chose to combine several areas within my practice). If on the other hand I'd been embarking on an apprenticeship of some kind, I'd have had to try to identify one without having those opportunities to find out what different techniques and materials actually offered.
To get in before anyone asks, no, I am not now a professional artist - I didn't pursue that route. But my degree is useful and relevant to me in a daily basis in the workplace. I did also subsequently do a BSc... in design and creative writing, for fun. And then an MA. These were decidedly not 'oh no, I must counter my useless arts degree with something Proper' choices, and both have also added to my skills in the workplace, in all kinds of ways.