Fair enough. But, there is a difference between “knowing your game” and “knowing your equipment”. Most teaching pros I encounter haven’t taken the time to become educated about equipment and its role in a player’s development. Also, most only deal in one company’s product (the one that sponsors them) and, while they may offer nice things, it may not be what’s best for you.
Consulting with an experienced racquet technician isn’t an insult to your coach. In fact, it may help them to teach you better, since you can get any equipment problems you have sorted out. I urge pros to work with me: I’m not out to steal students, just help them play better.