Pretty caught up on semantics aren't you.
Also, why would you mention the variables that affect HR, and not the variables that affect time? You mentioned that heat affects a 4:30 km, but not running surface, incline/decline, technical aspects, nutrition etc. I'd say that the variables that...
Far more personalised and relevant data that can be used instantly on the spot.
If you don't see how that isn't a physiological benefit, then perhaps you don't understand how hr gives better feedback than speeds.
Classy opening there champ.
For fitness benefits, splits, averages and distances are pieces of data that you need to know how to use and interpret. If you don't, then it falls well short of the physiological benefits that a decent HRM will give you.
As for you gladly spending the money so...
Really does depend what you want it for.
If you want it to do the impressive show off sort of stuff, like track your run and give you stats, it is probably fine.
If you want it for exercise benefits, you really need a HR component. Anything that is first and foremost GPS is to impress...
If you have the extra coin to spend, the Suunto Ambit 2 is a great bit of kit.
Can do as much as my old ex physiology lab and it sits on your wrist. Far better than Garmin in terms of features and capabilities, but not quite as user friendly.
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