We should also note that at the time of this writing Homey does not provide integrations that work with thirdparty cloud services that require two factor authentication, like Arlo. Currently it looks like most people are using IFTTT as an intermediary for partial integration.
None of this, of course, is to say that homey is a bad system. Just that every system has pluses and minuses, and companies like homey and smartthings that write their websites in marketing speak can make it difficult to see exactly what the differences are. 
we should also note that there are reports just this week of integration problems between Arlo and smartthings, which is a new and as yet undocumented issue. The Homey issue is an architecture limitation and applies to a number of brands.