MIL hates my registry message - help!

When we got married, my partner’s community gave us only off-registry gifts. Everything from a basket of booze (we really don’t drink) to laundry detergent. Needless to say, we were frustrated because we’d been told to make a registry and actually needed / wanted the things we put on it. Fast forward a few years and we’re expecting twins, and so we made a baby registry. We put a message at the top essentially very gently asking people to buy off the list (specifically due to what happened when we got married - we had multiple friends proof this message as well to ensure it was kind and respectful) and my MIL just let me know she is NOT in favor of it because people might want to get us “sentimental gifts.” We’re also not sharing the genders for this specific reason - to minimize random blankets / onesies / etc in favor of stretching resources and buying secondhand or dressing them in hand me downs.

We’re extremely practical people, first time parents, and we’re still divesting ourselves of some of the random things we received a few years ago when we got married. This time it’s a bit more serious as we were not expecting two and all the expenses that come with them. So am I the worst for asking people to buy off the registry if they’re going to buy at all? We have a variety of price points and even a cash fund and would way rather have $5 than some random stuff we don’t need… Help!