Abstraction has a slight cost but doesn't inherently mean it's very expensive. The cost of abstraction is generally worth buying because it allows you to write code in more independent blobs which reduces complexity and thus bugs and potential bugs.
But using abstractions to "solve" a hard problem is dearly expensive. By "solving" I mean pushing up the hard parts one layer at a time until you eventually can't avoid solving it for real. At best, maybe you're lucky and someone else has to solve it, by working through all the layers of abstractions you built on your way to negotiate yourself out of the hard spot. But those abstractions are expensive because they don't reduce complexity nor offer any tangible benefit except keeping their creators in their comfort zones.
But using abstractions to "solve" a hard problem is dearly expensive. By "solving" I mean pushing up the hard parts one layer at a time until you eventually can't avoid solving it for real. At best, maybe you're lucky and someone else has to solve it, by working through all the layers of abstractions you built on your way to negotiate yourself out of the hard spot. But those abstractions are expensive because they don't reduce complexity nor offer any tangible benefit except keeping their creators in their comfort zones.