Yes, common solution I see people adopting is using another device to download the maps.
To add to what Wapping wrote above, apart from having to faff about with cables and all (that wouldn't be a massive issue) on more recent versions of MacOS using maps on a tethered device is extremely slow even when using USB3, and doesn't seem to work properly.
I posted a couple of videos on another thread in here. I also voiced my concern on the Garmin Support forums (I tried to be as polite as possible but at the time of posting I was livid), no response.
https://forums.garmin.com/apps-soft...from-zumo-xt-unusable-what-is-garmin-response
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We're not talking a ton of money, but still, 4/500 quid are gone into a device that – at present – doesn't work.
I'm awaiting to receive my replacement unit (got replaced for some unrelated issue: it would "loop" on and off at startup) to test again and see if I can find a solution. But patience is wearing thin.
Funnily enough: Basecamp with my old GPSmap 60csx seems to be still working fine, despite all the limitations of the old device.