Zardnaar
Legend
This is not the normal game experience. If that is what it is at your table more power to you (and harder checks).
The only thing that harder checks achieves is the reliance on such abilities and the overimportance of magic. If you have lower checks, mundane tasks can be done with skills alone. Sometimes with magical help.
Try it out. Has worked wonders in 3.5 and it still works wonders in 5e.
Once your people know that they have a good chance of succeeding without beggin the bard and the cleric for inspiration and guidance for every simple task, the game goes much more smoothly.
Bards or a cleric aren't that unusual to have along with enhance ability. DC30 is extreme DC is is nothing special and DC 25 isn't that hard to hit.