Because for what PMR446 is designed for, the range is fine. You only have 8 channels (anything more claimed is just filtering) to use, so bigger range would make it far harder to get a free channel in busier areas. Ski resorts are already very busy with PMR (to the point of being unusable at times), imagine what it’d be like with everyone from the neighboring valleys trying to decide which cafe to meet at as well.
If you need the range, going to licensed ones isn’t too hard or expensive (£75 for 5 years iirc when I worked on a big campus and needed them for roaming IT techs) and you can go up to 5W. The units themselves get a lot bigger to accommodate the battery needed to work at that power and still get decent battery life.
As far as PMR goes, those Motorolas will be fine.
Bear in mind that you can’t use these in the US and Canada without a licence, and that if you buy the equivalent unlicenced ones over there and bring them home, they clash with many European emergency services (inc fire in the UK).