I know Brendan Fraser does this. His pieces are nothing short of amazing. Blending on his pieces are topnotch.

You can achieve a realistic hairline with a piece. I don't know how having a 'real hairline' would help with maintenance. You would still have to apply tape and attach the piecce. I think it would make it more difficult to attach well. However, I can see advantages - not having to worry about putting pressure on the front hairline would be a big one.

I had the same stream of thought when I was wearing for a short time. Truth is though, I don't anymore. Attaching the piece correctly has become very easy. If you have been wearing for a short amount of time, keep at it until you get good at attaching. Then consider whether a front transplant is for you...