A 14nm hot Vega 20 inside a 15” MBP with a 14nm Intel i7 or i9 is. A recipe for disaster. Two 14nm chips.
A well configured 15” MBP with Vega 20 will cost $3,000 roughly.
I’d rather spend $1,500 on a 13” MBP and $1,500 building a Gaming PC.
Or $2,000 on a new 13” MBP with 8th Gen Intel and $1,000 on an iPad Pro.
But dumping $3,000 into a 15” MBP with Vega 20 is a big fail.