Rogues reliable talent gives ability to treat any skill/tool roll that you are proficient from 1-9 as a 10. So you cannot fail easy/medium tasks or even hard ones.
But, one reason why everyone is focusing on getting skill bonuses as high as possible is to negate the chance to fail at easy tasks.
What if when you gain proficiency in a skill/tool you treat all rolls of 1-4 as 5.
when you have expertise, you treat all rolls 1-7 as 8.
rogue with reliable talent will treat all rolls with proficiency 1-9 as 10, and
all rolls with expertise of 1-11 as 12.
with this change expertise can be lowered a little to 1 and 1/2 prof bonus(round up)
that is:
+3 at 1st level
+5 at 5th level
+6 at 9th level
+8 at 13th level
+9 at 17th level