Totally agreed. No doubt and a 2nd thought! 
Well... I personally believe that synthetics / fully synthetics are the best, and best for bucks!
(I am not considering premium, and extremely expensive engine oils) Then semi-synthetic, and lastly minerals. If you will be moving from mineral to synthetic, you will get best properties from your engine oil (it will not deteriorate early), and consequently, best performance, however, from synthetic to mineral, performance may get affected.
Pardon.
I did not get it, and its context?
Totally agreed and rightly said! 