QUIC is a reliable transport. It's not "fire and forget", there is a mechanism for recovering lost messages similar, but slightly superior to TCP. QUIC has the significant advantage of 0- and 1-rtt connection establishments which can hide latency better than TCP's 3-way handshake.
Current implementations have some disadvantages to TCP, but they are not inherent to the protocol, they just highlight the decades of work done to make TCP scale with network hardware.
Your points seem better directed at HTTP/3 than QUIC.