One example, the started (and then stuck) net/ip to net/netip migration?
The tailscale netip package is great (as external pkg), but without commit to a full migration plan, just sprinkle here and there some (half/done/slow/wired/bridge) interfaces leads anyone, who tried to migrate, stuck as well. Some all ready started to migrate back ...
"Great" is far fetch especially "you shouldn't use Go for production services", which does not make any sense, also the same author works for a compagny that uses Go in places, which is kind of funny.
The reason the biggest parts of go/crypto is well designed, good readable code, is mostly the work of one person (the author).