They make you use a map for a good reason. It teaches you what its like to be lost and it will help you appreciate GPS when you can use it.
Apart from that its pretty much just bad practice. You really should be taught how to use what you will actually use in the real world.
When you use a map you need to learn how to deal with being "temporarily unsure of position" quite often. You need to be used to spending a lot of time looking at the map trying to work out where you are.
Once you can use a GPS you will know where you are instantly it will be much safer. On the very occasional time that GPS fails, it hardly ever happens, you will find its easy to get help on the radio. Just like you had to when lost because you are using a map.
Some people don't like to use GPS, they are the ones who get lost and infringe airspace.
Other people will be along to claim a paper map is a great idea.