I've been in crypto for the last 4 years and I've been a maxi for the last 3. However, I've always had respect for the Monero project. Can somebody make the case why Monero does not live up to it's promises / is a scam / will fail?

More specifically I'm interested in the hearing arguments about the following issues:

a) Is Monero as suited for it's stated goal of private transactions as it claims
b) Is it better suited to this goal than using properly coinjoined btc over Tor
c) Is Monero actually decentralized to a decent degree
d) Why Monero will fail in the long run