That depends on the size of your home and your WiFi needs. If you live in a small apartment and rarely connect to the internet from more than, let’s say, three devices at the same time, then there’s no reason to spend a large sum of money on a high-end router.
On the other hand, it’s often impossible to provide decent coverage and capacity in large houses without a mesh WiFi system. Of course, even the best WiFi can perform poorly unless it’s installed and configured correctly, which is where WiFi analysis software comes in.