I host 100s of high traffic, high speed, WordPress sites.

If a client asked me this question... I'd say...

This type of spaghetti setup is okay for a hobby site. Not for a real + money generating + pay your bills type of project.

For real (money generating) projects. Keep tech simple.

I run straight up Apache + FPM PHP + sites I host load test at roughly 1.1M request/minute throughput. You read that right.

There's all sorts of myths about what's required for fast sites.

My guess, 99.999% of everything written about fast sites is written by people who've never run a high traffic site or don't understand how to setup sites to isolation + fix slow points.

Do yourself a favor + hire someone smart to host your site.

In the long run, you'll save a truckload of money.