Thanks! So true.
I have done the Ancestry DNA test, and then I downloaded the raw data so I could upload it to MyHeritage and GEDMatch, which are definitely worth it (and it’s FREE 
to upload the raw data, look at the results, and compare to the other people using MyHeritage and GEDMatch).
MyHeritage gives me a slightly different breakdown, and they organize the regions slightly differently. Ancestry lumps Wales in with England and Western Europe, but MyHeritage groups it with Ireland and Scotland instead, which seems more sensible maybe, though I am not an expert.
It has been a fascinating journey as I compare the results from my DNA with all the different branches of my family tree I am now discovering, putting names and dates - and sometimes crazy stories from history - to the data from my DNA. I knew nothing past my birth-mother, born in the 1950s, until very recently, so I am completely blown away. The two seem to match up pretty well - as I struggle to fill in the gaps and then compare the genealogy results to my DNA, it’s pretty much a perfect fit. I was able to find a ton more Welsh ancestors last night. So cool. I’m surprised I was able to pry myself away from my computer to go to sleep!