You are comparing a 2013 MBP, most likely with a deteriorated battery, to a 2016 Skylake-based Precision. A 2016 MBP will run circles around your Precision. The only thing it doesn't have is a 32GB RAM option.
That is true but with how technology has advanced since the release of the 4th generation Intel Core technologies to current 6th generation, it hasn't advanced much to the point where its a big deal. The only advancement is how much resources a system has to work with that will determine the real performance and thats where the Dell excelled and the MBP failed.
For example: On paper, you can see that the 2013 MBP with the highest available i7 processor (at the time) compared to the highest processor allowed during the purchase of the Dell (at the time), the 2013 MBP comes out faster than the 6th generation skylake processor found in the Dell. See attached screenshots from 2 results randomly from Geekbench.
Your battery concern is true. The 2013 is running on an older battery compared to the Dell. However, comparing the actual capacity size available, the Dell still beats out on top. Why do I say that? Well, my current specs for the 2013 MBP battery is degraded but it is still at approx. 80Wh capacity. At any normal day to day uses, it gets roughly around 5-6 hours which is great for a battery that is 15-18% wear level. The Dell, which came with a 84Wh new capacity, currently is at approx. 76Wh if you count in battery wear, gets 6-7 hours usage from day to day. Overall, the skylake chipset is more energy efficient but overall, it still beat the MBP, even if it was by a little, it still came out top.
My point is, the MacBook Pro is not the best computer ever created or the best computer on the market or whatnot. Overall, every company has and will make a good product. While I can't speak for QC issues or other issues that might come up, Apple's not God and they don't make the "best" products in the world for the price. There's plenty of options and at the end of the day, all that matters is: does your product work with your workflow? If it does, regardless if its PC or Mac, then you're good. If it doesn't, then switch it up until it works with your flow.
The whole comparison is a joke. Even though I say the Dell beats my MBP in every department, I still use my MBP more because of my workflow being more consistent on the Mac. But regardless, I still like the Dell due to its performance and capabilities and surprisingly stable for Windows. If I could have the same apps that I normally use on macOS be merged with Windows (or vice versa); I would switch and be dedicated to one OS in a heartbeat. However, that's not an option for me. Personal preference I have both likes and dislikes between both laptops. For example: I like the dell's form factor much better. Its smaller, sleeker, and overall good looking. But software wise, I'd prefer macOS because its more uniform and more pleasing to look at. But I'm not 100% fully set on one or the other.