so what you're saying our daily usage of those two tracks should be done away with for "well, we might need them to do this..."
No. We need them as they are now. they are important to our operations NOW. Some places need to be non-revenue trackage.
For example, those spurs are used to reverse trains just about every day, moving between the concourse line and 207 street, especially work equipment, which can wait there out of the way of the road until control can caution them and 59 can get them a clear window.
You know what, right now, the next location you can turn an OOS, BO, or work train around in that will not block an active track while it waits is? Ether second Avenue on the F or the A5 spur north of Chambers Street on the A/C. (A5 at Penn Station is currently not usable)