Then why not just building a 2200G + A320 + 8GB + 1050? It's only like 30$ more for a more future proof build that destroys the G4560 in CPU performance. And quad core instead of dual core is something customers understand and are willing to pay for.
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I agree with you, that's the main thing with the new APUs, finally you get a good CPU side and you can easily justify buying it for discrete graphics usage, for CPU performance alone, and the 2200G is price well, also the clocks are high enough that you don't really need to buy B350 for OC.
the IGP is still not really that interesting for gaming due to memory bandwidth, I think there is validity in comparing the IGPs to cards like the RX 550 or the Intel IGPs, but once you start to consider cards like the 1050 for comparison, forget about the IGP, the performance is on a different level.
still, unless you have a 1060+ I think the G4560 is perfectly fine (less so with AMD cards, Digital Foundry showed in some videos that the RX 580 loses a lot more with the G4560 than the 1060 does), it's a dual core with HT, like i3s used to be 6 months ago.