Up to 100 Mbps offered by 4G is more than enough for most use cases. The actual speed of course varies based on countries infrastructure, but the fundemental issue with 5G is the range. As they are high band waves, their range is so limted and easily blocked that you need to have the tower basically outside your door for it connect.

The push for 5G is mainly the companies who missed 4G deployment being able to now reserve new bands and push their way into the market.