The addresses starting bc1 (bech32 P2WPKH type) are a new Segwit only type to make addresses easier to use. They essentially make addresess case-insensitive, e.g. BC1MYNEWBITCOINADDRESSISBECH32 is the exact same address as bc1mynewbitcoinaddressisbech32
So the number of possible addresses is reduced using bech32? Isn't that a disadvantage.