expertise and reliable talent mechanics should be far more present in the game, especially for martials, they need them to undercut the swingyness of the skill system's d20s and so actually be reliably competent in their areas of expertise.
I like to have plenty of low DC skill checks so the guy with +9 Athletics can feel competent when he auto passes all the DC 10s. I think with 5e it's important to avoid much scaling of DCs by party level. Keep most DCs in the 10-15-20 range at all PC levels. If there is a DC 30 it should be for something truly 'nearly impossible'. Then the level 20-Epic Barbarian with STR 30 (minimum Athletics roll 30) can feel good about auto succeeding at breaking the Black Gate of Mordor.
Rather than Reliable Talent, I use the rule/implied rule that repeated attempts use the character's Passive score. So eg if the DC is 18 the PC with a +9 will succeed eventually, maybe taking a minute. The PC with a +7 either succeeds first time or can't do it.
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