Lactate Testing VS Field Testing

I've tried to present an objective comparison below. Truth be known, I'm a believer that there is no better measure of performance than performance itself.

Lactate testing:
- Measures lactate at various work outputs: power (wattage or pace) at aerobic capacity, power at anaerobic capacity
- More power at given lactate value equals higher fitness.
- Level of change can be gauge of effectiveness of training with modifications based on response.
- Retesting is important as lactate function changes with training
- Can uncover relative weakness and show where training should be focused more, aerobic or anaerobic
- Tells us what lactate is at various paces, therefore what paces we should train at for various zones, 1 through 5

Field Testing:
- What the body is able to achieve in field tests (going as hard as you can for x minutes sustainably) tells us the workload at functional threshold.
- Relative paces (endurance, tempo, VO2Max) can be determined from field test using available charts (ie MacMillan, Coogan)
- These same charts will reveal relative weaknesses if they exist at different exertion levels
- Field test workload at functional threshold (determined by perceived exertion) is indicator of improved fitness and training effectiveness