The base 15" has almost always been $2399. There was a brief period where Apple offered 15" without the dGPU for $1999 if I remember correctly, but that model was dropped in 2016.
I don't know if that's this simple. Some stuff got more expensive, in particular CPUs (e.g. bulk pice for quad-core Ivy Bridge in the 2012 model started at $378, while for the hexa-core Coffee Lake in 2019 it's $395; the i9 is listed as a whopping $556). RAM also got more expensive on some models (LPDDR vs. DDR), there is additional cost of thunderbolt controllers and universal port wiring etc...
I think that our 2014 MBPs were less than $2,400. Maybe $2,200 or less. I recall paying less than $2,000 for them with the educational discount.
Yes, CPUs went up but RAM and Storage went down. You also had more logic in the CPU and motherboard.
The i9 is the biggest factor that I could see in getting the 16 price down. The GPU, second. It is possible that AMD might push Intel's prices down but I doubt it at this point. There are companies, including AAPL, where they would just stick with Intel.
I'm a big shareholder in AAPL and it's trading at $143 this morning. As a shareholder, I would prefer lower prices from AAPL as I think that this would increase shareholder value the most in the long run. More volume means more software and, eventually, more customers. I'm sure that Apple's marketing and finance people know this stuff and have models on price, demand, and software adoption.