Maxperson
Morkus from Orkus
No. For just about every roll someone in the group will have a high stat + proficiency(often expertise) which gives them greater than 60% and all it takes is one most of the time for a party success.Except that it's pretty close most of the time. That's why we have fairly flat bonuses. Most of the d20 tests that you make in 5e D&D will be roughly in the neighbourhood of 60%.