lightbrite: I brought up the TM mitzvah because to me that’s a super yiras shamayim.
Violating taharas hamishpacha is actually a very serious sin,
one that bears the penalty of kareis, being spiritually cut off,
for both participants. It’s not hard to see why someone
might be more careful about it than they are about tznius.
If tznius being so important is something that I contest, then
perhaps it is because it’s a huge issue for me (which it is).
If you find something difficult to do, that would of course
give you motivation not to believe in its importance…
(That’s the probable explanation for me and flossing, anyway.)