I have read various places that it's best practice to never use your Install account for anything except installation and applying patches. I've also read you should not use your farm account or any other service account to log into the server or do any admin tasks. Do people actually switch to a separate admin account? It seems like "Do as I say, not as I do" because:
Most tutorials leave out details such as what point during the install/configuration I am supposed to switch from spInstall to spAdmin.
I've read a lot of "What accounts do I need" questions on forums and TechNet. The accepted answer on this question doesn't even list an admin account as required.
After reading Todd Klindt's writeup on how to stop using spFarm, I question if it's worth the effort.
What permissions is the Install account going to have that the Admin account won't have or need?
UPDATE: Can anyone provide documentation (preferably from MS) explaining why I shouldn't use the install account for administration?