While acknowledging the variation that occurs on an individual level, so as not to suggest I think there is only one way to approach training, your description of both lactate testing and training, mirrors my own very closely! There is no way I’m running near my LT1 pace on the daily while also doing 2-3 workouts (I count my long run as a workout) per week. I’m also a 8-10 hours per week runner, which I think plays a role in how one perceives things. Sure if I’m only running 4-6 hours per week I’m going to be a lot fresher, but I’m also not nearly as fit on that.
Even when I’ve tried the “Runners World Approach” of running very little on my easy days and focusing on the hard days. The logic, which I concede is sound reasoning, of doing more on your workout days while doing a minimal amount on your easy days so that you’re more recovered for your workout days, just doesn’t translate physiologically, for me.
In fact, the times when I have been able to handle more volume in workouts, as well as density of workouts, was when I was running 10-12 hours per week. Despite my times improving minimally on that higher volume, my general aerobic fitness, ability to recover between sessions, and ability to handle more volume per session, was improved. That generally involved 1.5-2.5 hours per week of work in the LT1-LT2 range and the remaining 8.5-9.5 hours significantly slower than LT1.