Perhaps if you’re living somewhere where the ISP doesn’t offer 25Mbps (some rural areas, fringe buildings in a town the ISP doesn’t want to wire up / upgrade), the single ISP option is just bad, you want a backup option in case of a service cut / natural disaster, or you just want to carry it with you for whatever reason (expense of other options, more ‘secure’ connection vs local ISP in foreign country, usage in remote areas, etc), it could make sense.

And they are looking at the possibility of direct phone connectivity soon.

For the majority of people though, probably not.