[problems]

To use a classic example, who's going to go to bat for you when they get a demand from a government agency - the EFF or the Hong Kong Post Office? I know where I'll place my bets.

Go pull up your certificate authority list and ask yourself for each one of them if you trust that company more or less than let's encrypt.

Let's encrypt publishes auditable logs of all issued certificates, they're backed by some of the biggest names in online privacy and I trust them much more than other CAs.

I for one would be happy if I could delete all other providers from my browser.

CAs ultimately are centralized and too trusting, giving that same level of trust to less trustworthy companies just damages the overall security of TLS. There's no distributed trust model for CAs, it's pretty much all or nothing, so in the case of CAs, distribution is not a security benefit like it is in say Tor or Bitcoin, but a problem as it means the attack surface has widened.

Short of going to a new, completely decentralized solution like the proposed DNSSEC extensions or Namecoin, a single, very secure CA is probably better than a lot of not secure, often government influenced CAs.