Yes, new exchange is essential as it shall open more opportunities, more liquidity and brings more users into crypto. It also creates competitions which should be a great reason for exchange development and security. But users should be careful to use any new exchanges, never deposit huge funds in new exchanges.
it is not very clear why you need new exchanges? Now there are so many exchanges which already have very serious experience and reputation. There are already a lot of new exchanges that already have a lot of functionality. I think that creating even more exchanges will cause doubts among new market users.