Polling can be a fine place to start and is better than nothing. The speed of realtime updates does matter though. Even for seemingly boring use-cases like sync

Polling can be a fine place to start and is better than nothing. The speed of realtime updates does matter though. Even for seemingly boring use-cases like synchronizing CRM screens or something, it's still best if updates happen within a few seconds. And instant (sub-second) updates add an extra level of polish. Similar to non-flickering graphics and smooth scrolling, fast updates are impressive and can increase the appeal of an app.