For large-scale sales, consoles should be more profitable, because the ridiculous fees you have to pay there (royalty, distribution fee, digital distribution fee, patching fee, etc.) are small compared to the much higher average unit price. PC gamers expect stuff cheaper, but even Valve's now-unmasked greediness with the distribution fees (>30%) are smaller in percents than what Sony wants.
Technically, both pseudo-consoles have fixed hardware and software, so testing is easier. PC technically only needs DirectX or OpenGL tests, but in reality they need to check both CPU and all three GPU types and at least 3, but up to 5 OS kernels. DX12/Vulkan should help a shitton to reduce it for Windows, but it will never go away completely.
Of course, nowadays the deadlines are so strict and games are getting so complex that even console games need Day 1 patches and still can crash all the time.