Not really. The Linksys WRT1900AC has a 1.2ghz dual core CPU as well.
At some point you need a general purpose CPU to run everything and it's not hard to just throw an ARM SoC at it which is going to be in the 1-1.5ghz range and dual core because that's just what low-end is now.
The CPU is inline with top of the line routers these days (e.g. Asus RT-AC87U is a 1Ghz dual core). 1+Ghz dual core CPUs are really cheap these days.
The RAM is about 4x what other routers are packing but the cost difference between a 1Gbit chip and 4Gbit chip is a few dollars. Prices have been plummeting this year and 8Gbit chips replaced 4Gbit as the new hotness. Not to mention DDR4 rolling out so there might just be dumping going on that makes adding 1GB of RAM a non issue.
At some point you need a general purpose CPU to run everything and it's not hard to just throw an ARM SoC at it which is going to be in the 1-1.5ghz range and dual core because that's just what low-end is now.