himano has impeccable racing credentials, so they have really stepped up their game to distinguish themselves with the MTB focused group. A full 2.5 lbs lighter than Bosch's Performance CX, it also has the narrowest "Q factor" and allows for shorter chainstays. Just because it is lighter does not mean it is not powerful - it has 70 Nm of torque!
Q factor is the distance between the pedals - further out and the bike handles funny and pedals can dig in on hard corners. Shorter chainstays gets the wheel tighter in under the rider for more traction on steep climbs - something bigger drive housings like Bosch have a problem with.
Broken displays and controls are becoming an annoying and expensive part of eMTB - when you are really getting the most out of trail riding, the bike will go down eventually. If your display and controls are on top of the bars, they are vulnerable to being smashed. Pedaling your 50 lbs bike back without power is no fun, nor is shelling out hundreds of bucks for replacement parts. So the eMTB setup keeps them safely under the handlebar where they are less likely to get broken.
The mode selector on the eMTB system is very intuitive for regular mountain bike riders - it is on the left side under the handlebar, where a front derailleur shifter would be on a non-electric bike. Since 1x drivetrains has enough gear range to do away with front gears, now there is room right there. It feels like your shifting gears when optimizing the mode assistance for the terrain you are on.
Integration with top of the line, butter smooth Di2 electronic shifting is another outstanding feature only available on Steps systems at the moment.