Decrypting traffic on clients is also much harder due to the multiple types of clients you have and the fact that there is no easy way to MITM every connection the the client.
The security threat model by definition defines clients as untrustworthy hence relying on them for decryption is a flawed approach.
If you are going to be cocky and disrespectful at least be right.
Yeah, it's a hard problem. If you don't know half the things your clients are doing, it's much easier to pretend all the security conscious stuff will be going through TLS and then we break just that. It's also obviously wrong, as we all learned when they started filling USB ports with glue.
The boxes already rely on the client, unless someone signed another CA=yes certificate.
It’s simple a client makes an external TCP connection if that connection uses TLS the its MITMed on the network level and captured this happens to all connections if the client does not accept the handshake because for example the CA for the MITM box isn’t trusted or the client uses certificate pinning the client can simply refuse to proceed with the connection.
If the connection cannot be captured and inspected for any reason it’s simply terminated and the attempt is logged for future investigation.
There is no reason to break TLS on the client or compromise the browser it’s worse in every way and cannot be trusted.