There are numerous videos and galleries of other people opening those without shredding them to bits like you did. So despite them being glued, something about your technique sucked.
Remote controls are, generally speaking, among the most reliable pieces of electronics we use, and simultaneously one of the cheapest to manufacture.
Labor costs time. Suppose it takes 30 minutes to repair a remote control (when you include diagnosis, repair, retesting, paperwork, etc). A typical going rate for electronics repair in a developed country might be around $100/hr. So that’s $50 in labor right there. Who in their right mind would pay that when a brand new one costs that much or less??
They’re not morons for not worrying about repairability on a product that almost never fails, and stands a nearly 0% chance of being repaired if it does.
There are some truly egregious instances of wasteful non-repairability, but this truly does not qualify.