Hallo.
I'll try to help you too. Sorry for my english :D
When I am able to accomplish 5 x 1000m with 2 min recovery, so I can run that speed 5k, but I am still ready after that session to do another 1-2 reps, that's definitely important.
Some people go from speed to endurance, another one's from endurance to these reps and first one's cannot do very well these reps, i mean 5-7 times by 1k and long-distance runners can do even 8-10, that's the point.
Same to 10k time, hardly I can do that session "10 x 1 with 2min recovery" faster than my goal pace, especially if we got adverse weather conditions and so on.
It's even smarter to do these sessions not all-out, no need to try to compete in the training workouts and to train in competition.
I'd say, you should follow your mileage, threshold running (about 15% of volume) and some strides. After that you can use 10k reps and maybe sometimes 5 k reps, but no need to run faster.