On literally everything that happens, I come to a different conclusion than you. It's uncanny.
Here's a couple...
On "almost meeting your PR even on low mileage so maybe all you need is low mileage and to be rested"
1.) At the start of your thread you said your half PR was really quite soft...now you are satisfied with coming "close to" your half PR.
2.) I stated that your race times were you getting by on talent rather than actually becoming a better runner through training. I think the fact that you ran 1:26 on low training and 1:26 on what you considered high training proves that...it does not prove that you are better suited for low training. (Same with your marathon PR being your first marathon)
3.) You not giving credit to all the miles you put in last year and giving credit to not running many miles this year is not sustainable. It's like the build up and taper, but on a longer timescale. If you keep running low mileage thinking it will make you better you will be disappointed in the long run.
On "Allen's training times make him look like a slow poke" and "I am at my best when I only run 4 days a week."
You still don't understand running adaptation. Running slow on an "off" day is always a better advancement of fitness than not running at all. If you are capable of running 2 marathons in 2-3 weeks you are capable of running slow on your off days UNLESS you don't know how to run slow enough. Don't think of every run as a workout. I run 6 days a week. Let's use this week as an example.
Sunday, 16 miles long run, finished last couple at MP, but averaged MP+45s for most of the run.
Monday, 5 miles at MP+1:40...felt pretty stiff but I stumbled through.
Tuesday, 9 miles with 2x3mi @ MP-40s (don't tell the Hanson's...that was supposed to be MP-10s).
Wednesday, 5 miles at MP+1:20, felt similar to Monday but loosened up over the run so it was a little faster accordingly.
Thursday, 11miles with 9 @MP.
Now...On Monday my body would not have let me run at MP without major effort, same for Wednesday. I could have stayed home those mornings and had equal efforts to what I did on Tuesday and Thursday, but I know that running 10miles 90s slower than MP still helps my body learn to burn fat instead of glycogen, encourages mitochondrial growth, strengthens my tendons/bones/muscles, increases capillary density, etc.
So, if you just run for fun and enjoy the wind in your hair, and you don't want to follow a "complicated" plan, and you want to feel fresh at the start of every run that's fine. But don't bother asking what to do to get better. You can keep running 3:02 in perpetuity while other people go from 4:11 to 2:55 over a few years...
http://www.flotography.com/how-i-trained-to-run-a-sub-3-hour-marathon/
(disclosure: the person in this article is not me, just an example)