However, I maintain that there's nothing wrong with what we saw of the TARDIS interior in that serial. The interior is so vast, who's to say what can't be in there? From the imaginative to the boring. Either way, as a kid, I was wowed by that sequence.
To me, it went in the "boring" category. It looked like the producers were too cheap to build sets and too lazy to find a decent-looking location.
Also, I think that viewers these days, in the wake of the '96 movie and the modern series, are used to the idea of the TARDIS interior having a variety of architectural styles that could encompass anything. At the time I saw "The Invasion of Time," when it aired on PBS in the '80s, that wasn't the case. The TARDIS had a definite, fairly standardized interior style based on clean white or grey walls with roundels in them. And it was usually futuristic and high-tech-looking rather than having the retro aesthetic that's dominated since '96. The only exception to that was the wood-panelled secondary console room from season 14, and even that retained the roundelled walls and introduced grooved columns which were then repainted grey and incorporated into the later console room set, so it still felt like part of the familiar TARDIS aesthetic.
So when "The Invasion of Time" came along and showed us these brick-walled institutional hallways of mid-20th-century design, it was completely unlike anything that had ever been associated with the TARDIS, and so it just felt wrong and cheap and lazy.