I'm seriously considering an iMac these days. Currently I use a 2014-model 15" MacBook Pro, and it's heavy to carry to work every day. I also need a lot more disk space.

If Apple allow upgrading the iMac Pro with a 3.5" 12TB hard drive, I'd be interested.

The new MacBook Pros aren't suitable for my needs because they don't have ports. I need more storage, but can't upgrade my laptop. I don't want to go down to a 2012 MacBook Pro just to add a bigger hard drive in the optical bay. Also, I really like the Retina screen. So, how am I going to store the Big Data for machine learning on my office computer, while also having a nice screen?

The iMac seems like a more affordable option than a Mac Pro, and with cheaper, more suitable upgrades than the non-tower Pro.

If the iMac doesn't have a 3.5" disk slot though, then I take back all my compliments. The 4TB max SSD from Apple won't be enough for me.