1.) I know 100% that when you send bitcoins from legacy Address (P2PKH) then your public key gets revealed in transaction signature So this is also true in case of other Address formats (P2SH and P2WPKH) ?
Hi bro that's your Public key not a private key. Public key is designed that way so that it gives transaction a clear way wether it's gone and grim where it's been receiving. So Private keys are stored and if theses are revealed than your address might get caught and can he in danger of loosing your net worth.