NFTs are definitely not something you should be considered as long term investments. It will not last long and the cycle life of NFT is very short. This applied to the majority of new NFTs in the market right now.
You are right that NFTs are not designed for long term investment purpose, it is a unique type of digital asset which is proof of actual ownership of any asset on block chain that can not be replicated . I am pretty sure NFT market will flourish in coming months & years because its use case is growing fast from Art , sports , fashion to health care & many more industries. The growing number of NFTs platforms and trading volumes signifies its growth potential.