I'm fine with the path selectors getting moved out; maybe it'll encourage new path selectors to be developed. But there will need to be some userspace interface stood up to support your native NVMe multipathing (you may not think it needed but think in time there will be a need to configure _something_). That is the fragmentation I'm referring to.
I guess one config option that we'd need is multibus vs. failover which are used per use-case. I'd have to say that having something much simpler than multipath-tools does sound appealing.
