I am not exactly sure where this argument is going as far as the tablets and the Macs running the same OS. Just about anything I can do on my Mac I can do on my iPad Pro 9.7 or iPad mini 4. They both run software that I use all the time, I can pick off on one where I left on the other etc. I think they have pretty much merged iOS and MacOS together pretty well. Is it because they don't have the same name? I'm not understanding what the issue is. I can work on an Excel file on my iMac. get on the bus and work on the same file using my iPad, and then open up my MacBook Pro and work on the same file. I can even work on it on my iPhone. So I don't see where the problem is. 5-10 years ago this was virtually impossible. I used Excel as an example, but the same could be said for Word, PowerPoint, Pages, Keynote, Numbers, Informant, Outlook, OneNote, Day One, Fantastical, BusyCal, OmniFocus, AnyList, Quicken, Mail, ToDo, etc. For me the integration of Mac and iOS is very well done.
As far as Hardware goes, I just upgraded to the 13" 2016 MacBook Pro with the touchbar to replace my early 2011 MacBook Pro. I am extremely happy with the computer. A lot has changed in the almost 6 years. Yes, they are both 13" MacBooks, but when you compare everything from the specs , screen, the thickness it all better. Battery Life, I don't see an issue, my new MacBook Pro gets anywhere from 9-11 hours per charge, yet I read horror stories of 2-3 hours on these forums. The new Mac is almost as thin as my iPad Pro with the case and Keyboard cover. I love it. Instead of upgrading hardware every year, maybe you should do so every 4-6 years and you'd appreciate the changes more.
For me, my Macs, iPads and iPhone have made my life a lot easier. I can do whatever I want on any of the devices and it all stays synced thanks to iCloud or OneDrive. Hell I can even do somethings on my Apple Watch.