Not sure if this applies, but I got the web version of Inbox about 2 days after I installed the Inbox app on my phone. Ideally they'll release the web version soon after as well.

I second this. I cannot wait for the day where I don't second guess myself whether I want to put an event in my company's MSExchange calendar, or google calendar because I don't know if I will see it if saved to the latter.

The web-based version is way too outdated. Given Inbox was written using the newest GWT, and I assume Calendar is using an older version, maybe it won't be such a big deal to refresh that, too.