It's a common assumption: the WiFi is bad in the back bedroom, so the fix must be a better router. In most homes, that's not actually the issue.
Coverage is a placement problem, not a horsepower problem
A single router, no matter how powerful, has to push a signal through walls, floors, and whatever else stands between it and your device. Adding a second or third access point in the right locations solves far more dead zones than upgrading a single router ever will.
Device count matters more than most people think
A modern home can easily have thirty or more connected devices between phones, laptops, TVs, thermostats, cameras, and smart speakers. Consumer routers are rarely designed to manage that many connections gracefully, which shows up as lag and dropped connections even when signal strength looks fine.
What a proper network design actually includes
A professional network design starts with mapping your home and identifying where access points should go, not just plugging in more hardware. It also typically includes a separate network for IoT devices, so a cheap smart plug isn't sharing bandwidth priority with your work laptop.
If you've already tried a new router and the dead zones are still there, the fix is almost always placement and design, not another box from the electronics store.