If only they'd given the desktop R7 1800x and 1700x the same amount of PCIe 3.0 lanes as they've done here per 8 cores instead of a measly 20 lanes we might have been able to do Raid0 with two M.2 ssd's

I got the impression the Opterons weren't really that high in demand. By the time the good ones were released, ARM and GPU-based servers were getting pretty popular. Unlike Xeon, there weren't many (if any) socket G34 Opterons meant for workstations (so, I don't really understand your whole "CPU for playing game" thing).

the going down in demand have started with the G34... Lot of hype, surfing on the success of opteron (at this moment nearly 2 over 3 server were Opty)... then nightmare started "the launch will be later this year to be more nice" (X3 or 4 times) During this time Intel made new Xeon... and so when the 1st G34 is in shop it was nearly obsolete, on top of that AMD had at this moment an awfull support and so lost consumer: less consumer = less partner = few system / motherboard to put the CPU. yes today it is more and more ARM, and GPU based system (mainly NVidia due to aviability of AMD outside NA (same old AMD's demon) ) for big system. but there is still "regular" server demand and this is the target of this CPU. also workstation use more and more mainstream CPU (I3 mainly) with pro chipset, it's a clue that Xeon for workstation is priced too high (hmmm +500 Euro to support ECC and have a lower frequency??? ). But intel have good support whatever CPU you have bought (to play or to work). so we will see...

ARM server really ? i only know some attempt to it and now it is completely on a break, ( well not really a break, they are a tons of small company who announces things here and there, and on the end,, nothing ).... some company as X-gene... but seriously outside there announces.. In reality i ask me if they even sold enough systems for "start" to enter the market.

Yes, ARM servers are great for things such as basic web servers. You don't need a whole lot of processing power to run the average website. Intel options are too expensive, PPC and AMD options are too power hungry, and GPUs don't handle the applications very well. Meanwhile, you could use any alternative hardware to handle storage and databases.