I guess it will come down to pricing .. .. I guess ... maybe ..
Well, they give the IGP away for "free", and most people willingly pay extra to get something better.
My thought is that this isn't that far away from their own IGP, when you look at the entire spectrum of available GPU products.
I can't find a direct comparison, but can try to infer it from two reviews:
Latest Ice Lake Gen 11 IGP performance here:
Intel’s 10nm Ice Lake processors are here, and we had the opportunity to benchmark one on a software development system.
www.tomshardware.com
Some +/- in the data, but there is a comparison with an MX250-based laptop there, and the MX250 is mostly consistently faster, but only barely.
Then this review, where a MX250 is compared versus a GTX 1050 Max Q:
We thought that it’ll be a good idea to compare the least powerful NVIDIA GTX video card on the market with their top low-end GPU – MX250. The Max-Q version of the GTX 1050 has reduced …
laptopmedia.com
The 1050 is faster than the MX250, by about 35%.
This is hardly a scientific test, and these aren't exactly the best sources to be pulling from, but... if I connect the dots and fill in a lot of gaps and make an educated guess, I'd say the Intel GPU will be about 35ish % faster than something your going to get for free anyway. It would have to be pretty cheap to make it even a consideration for any sort of DIY builder.
A few people have mentioned they thought these Intel GPUs were destined for the OEM builder market to shovel into mass produced rigs where people don't care or don't know any better, and I have to say, I can't see any other market where they make any sense at all.