Thermocouple wire gauge/diameter/size at high temperatures

I have to ask this question.  Maybe my Google skills are just failing me, because it seems obvious, but I can't find the answer
I understand about problems with high resistance in thermocouples that use too much thin wire, but why are there lower high temperature limits given for high gauge wires?
What happens if I use these thermocouples at such temperatures?  Is the concern just that the wire will burn up quickly, or is there some reason that the temperature readings will be inaccurate?

And there another point: Oxidaton/Obladation and reactions with the isolation material will change the Seebeck coefficient -> sensivity of the TC.  You cant avoid it, just try to minimize it.
This is a function of temperature and the ratio of surface to material -> smaller diameter faster change in sensivity.
So you can use a smaller TC wire for a shorter time (until recalibration/replacement)
Greetings from Germany
Henrik
LV since v3.1
“ground” is a convenient fantasy
'˙˙˙˙uıɐƃɐ lɐıp puɐ °06 ǝuoɥd ɹnoʎ uɹnʇ ǝsɐǝld 'ʎɹɐuıƃɐɯı sı pǝlɐıp ǝʌɐɥ noʎ ɹǝqɯnu ǝɥʇ'

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