When I think about carrying on doing my job, will my cadets now know I can no longer petition the Queen when the Officers' Mess runs out of Coq au vin? No. Will they know that I'm now commissioned into the Air Cadets rather than the VR(T)? No. Do they give a flip about how my commission works? No.
But what I guarantee they do notice is the fact that I look like a tool that's forgotten the correct rank slide, and has just bodged on a light blue one in the hope no-one notices.
The RAF have got it right. Officer Cadets on IOT have green backed sliders, and blue backed sliders, to be worn at the appropriate times. Therefore, the RAF know what to expect. Pardon me for wanting to at least look competent and professional when I'm dealing with the likes of station armourers, etc. They too will notice the abomination of a light blue slide on DPM/MTP. And again, to clarify, I'm not talking subdued rank, I'm talking blue braid on an appropriate slide.
Furthermore, I am involved with fieldcraft. Actively involved. So when I've been crawling around, and get back up to find my nice light blue rank slide is now gopping, won't ever be clean enough to wear smartly with blues, what am I to do? Your retort will no doubt be that I should take my rank slide off, but why should I have to? Why should I not have the right kit to start with?