The reasoning behind the change relative to a ‘regular’ keyboard is the same as many of the other layout changes behind the Model 01 – that your pinkies aren’t strong and dextrous. We did make a different choice than Kinesis about where many keys should land. I’ve never been a fan of the Kinesis’ default layout and I’m sure that impacted the design decisions.
Everything under your thumb is ‘special’ in our worldview, in that it’s either hit with a very high frequency or often used chorded. I don’t have key frequency charts in front of me at the moment, but, IIRC Enter’s frequency doesn’t rate high enough to end up there.
All that being said, “Fn-Space” also generates Enter and might be a comfortable way for you to get there.
Keyboard layouts are (or ought to be) a very personal thing. Everyone’s hands are different and years of training on one layout is definitely going to impact how you feel about others. Remapping the Model 01 to suit your brain and your hands is something we encourage, but we wouldn’t be sad if you gave the default layout a bit of time to see if you get comfortable with it.
[Also, while we’ve spent years crafting our layout and design, this is our first commercially produced keyboard and we might just be wrong ]