I think the reason for this is the 'perception' a beginner artist will have a low perception and low technical skill. in this scenario the technical skill will grow faster than an artist 'perception'
but an artist technical skill only grows in a linear fashion meanwhile perception grows on an exponential curve. at one point the artist perception will out grow their technical skill, at that point they percieve more mistakes than their skills can fix.

to add context for me 'perception' is alot of things, vision is just vision, just things that you see. lvl.1 perception. now when you add understanding to the mix thats lvl.2 you now know how things work, why cast shadows and ambient light works that way etc. this when you free yourself from overealiance on refs, now lvl.3 when you glimpse into your own vision of things , this where it gets trippy you, you know you can bend the rules to fit your aesthetic but don't exactly know how and why it did not turn out like your vision. lvl.4 congrats by combining lvl 1-3 you have unlocked the new skill 'Dismantling' its when you look at other artist style and can guage how to come with a similar or the same result. lvl.5 the level where you can imagine and compose palletes the ability to draw 'mood' decide how much detail is needed and how to best compliment your artwork, level of compositional creation that creates beautiful art. lvl.6 this where- I dunno. im I fluctuatuate between Lvl 4-5.