That's fine you feel that way, but it is 100% subjective opinion on your part. The new models and the decisions they made are not a clear win at all.
For me, save for newer internals (which don't matter for me - it's close enough) & the screen (but only if you have them side by side or have a specific use case for the new one), everything, literally everything, about the 2015 15" MBP is superior for me.
The trackpad, the keyboard, the array of useful ports, the time tested durable and reliable casing, just - all of it.
The models are different enough, despite being the same line, that it really matters who you are, what you're doing and what features you care about to decide which is "better" for you.
Just one example of zillions I could share, but yesterday I was in 3 locations and put a USB-A thumb drive in and out probably 45 times. I would be going insane with a dongle doing that, having it hanging off, making sure not to lose it as I was moving around, etc.
At the 2nd office, I ended up docking the machine to get a bigger screen for some photo work for an hour - Guess what....HDMI plugged right in. Man is that nice as I didn't know I'd be doing that.