Agreed...but from a budget ITX build standpoint, they would provide an ideal iGPU-based build.
-- i3-8100 with ASRock Z370M ITX board: $255 USD (https://pcpartpicker.com/list/yDD2vV)
-- i5-8400 with same motherboard: $327 USD (https://pcpartpicker.com/list/sQTBXH)
-- ASRock AB350 ITX board: $80 USD (https://pcpartpicker.com/list/mzgLTH), so would cost $179 USD with the R3 2200G or $249 with the R5 2400G
Until Intel can release the H & Q chipset boards for their Coffee Lake line, you're looking at a Ryzen APU-based system costing about $75 less than the comparable Intel Coffee Lake ITX build, but with the potential for overclocking still in there. From a gaming perspective, any edge the Intel system might have on the CPU side I'm betting will be offset by Vega's performance on the graphics side. And given the current spread between H270 & Z270 boards is only maybe $40 USD, I don't know if the non-Z sets are going to help offset that.