I'm having a hard time understanding why anyone would ever use expensive lubes like Krytox?
If you change keyboards every couple of years it may not matter.
Long-term, the different plastics and different lubricants age in unpredictable ways, and may or may not interact with each other. A lubricant that seems to do very little to a plastic in 10 weeks may have done serious damage after 10 years.
If you are lubricating large accessible pieces like stabilizer wires, old lubricant can be wiped off and replaced.
If you are lubricating the inside of a tiny switch, it is nearly irreversible.
Also, the amount of lubricant required is miniscule. I am not big on lubricants except for stabilizers, but I have 2 syringes that hold maybe 5cc each that I have used for a couple of years. The thick one one, for stabilizers, is almost empty and the other one, for switches, is still over half full.