What are the properties of ethanedioic acid that make you think that it is a good choice for standardisation of alkali(NaOH)?(Why we do not use HCl or H2SO4 to standardise)

Is it because that it is,
:a weak acid,pure,stable in air, readily soluble in water and have a relatively large relative formula mass.

:a solid acid whose mass is an accurate measure of the number of moles of H+ ions it will require.

Anyway for extras:
:We cannot prepare standard NaOH solution by dissolving a measured mass of pure NaOH in a known volume of water,because NaOH is
hygroscopic,which means it readily absorbs atmospheric moisture. (Results in inaccurate concentration?)

:The balanced equation for the acid-base reaction involved in the standardization procedure is;
H2C2O4(aq) + 2 NaOH(aq) → Na2C2O4(aq) + 2 H2O(l)