[masteringhouse]

Great sound enhances art (unless the intent is to be ugly) it doesn't create it.

With less experienced hands in the audio production process it's even more important to have the opinion of a professional, not less. The work that I get from bigger name engineers requires consistently less effort in mastering than that from indie artists, and usually sounds better since less processing needs to be done. If you want your music to compete with major label artists it doesn't hurt to have the opinion of someone who's had a few years and albums under their belt. Especially when it's the last part of the chain where you can correct any issues.