Inbox looks like a jumbled mess to me, with randomly sized images and pre-rendered images, and it makes me scroll a lot more.
Annoyingly, the new UI is slightly less dense than before, but it's still much better than Inbox.
If I had more emails, or more emails I actually had to address by replies, it might be different. I never noticed the "images" in inbox though. Are those for things like purchases or travels that it renders differently? My emails just look like subject lines, with about the same density in inbox as in classic gmail (Quick check: An inbox email on desktop is a 32px div with 6px padding, while a gmail email is a 39px table row - so quick estimate is 5px more per email for inbox)
A quick an dirty screenshot-on-my-current-machine shows inbox compact emails at 60px vertical, vs 50 for the new gmail. All of the difference seems to be whitespace, the fonts are more or less identical. There's extra waste for "Today" and "This month", and with a couple of expanded pictures, I can't even fit 10 emails vertically on my screen (MB 12"). Gmail shows 20 emails in the same space just fine.
It's quite possible that if you have just the right volume of email, the Inbox format is perfect. It's also possible that most people don't mind scrolling. Me though, I like to see as much as I possibly can at a glance.
I just want an as simple as possible list of emails. Basically the compact view in current gmail, sorted by unread - not by some automatic folders or anything similar.
If I have to do something at a specific time I'll create a calendar entry. If it's a newsletter that I don't care about I'll unsubscribe. Email for me should be a list of messages, nothing more, nothing less.
Same goes for other goole services, such as google play music. Everything is super large and with a ton of padding, and you can't see more than a few songs in a list because the elements are so huge.
Edit: nvm I found a video explaining it. Probably never missed it bevause I use a separate calebdar and never use Google for that.