I can think of many "downsides" but whether those matter or are actually upsides really depends on your use-case and perspective. * You cannot (easily) track i

I can think of many "downsides" but whether those matter or are actually upsides really depends on your use-case and perspective. * You cannot (easily) track interaction events (esp. relevant for SPAs, but also things like "user highlighted x" or "user typed Y, then backspaced then typed Z)" * You cannot track timings between events (e.g. how long a user is on the page) * You cannot track data such as screen-sizes, agents, etc. * You cannot track errors and exceptions.