I have no qualms with ZGC being the default. The low latency that it offers at near G1 speeds is a very good trade off (IMO).

I just have a problem with G1 because in my experience, the best place for it is fairly large heaps. Get something sub 2 or even 10G, especially if you have a few cores to offer, and the parallel and often even the serial collector will give G1 latency even on major collections with superior throughput and overhead.