Not at all! In some cases, it can be better because your eevee(lution) can unlock its potential much faster, and it doesn’t deal with the stress of resisting its urge to adapt to its every environment. The downside, of course, is the fact that it’s deciding early what it wants to be, and not all eevee possess that level of confidence in its decisions that early on. However, if an eevee wants to evolve into a certain form and is absolutely sure of that, then it’s perfectly fine.
On that note, congratulations to your sylveon! She certainly sounds adorable.
No, Bill, you can’t ask an anonymous poster for pics. —LH
But what if I strongly imply that I would like to see pics? —Bill
No. —LH