Is CNAME / URL flattening a bad practice?

[Dissident_SLC]

I recently have moved a number of websites top a new server and have made the use of CNAME / URL flattening (I believe these are the same?). A network admin had said this is an unrecommended practice. From what I have read it seems flattening can be beneficial for site speed and SEO even if very little.

[HiveDigitalInc]

Generally speaking, having a flatter URL structure is typically a better play for SEO.

To better understand why your network admin may have an issue.. can you provide a few examples of "old url" and "new url"..  You can use anonymous fillers, but I'm just looking to get a better understanding of what you have done.

Cheers,

Jake