I have a couple of pipes that I dedicate to English blends with Latika but otherwise, do not dedicate pipes. I should say that I smoke mostly Lane BCA and Butternut Burley and those are nice blended together so I don't see the need to dedicate pipes to those. I need to branch out and try different tobaccos. I have some Escudo and Nightcap that I tend to use the same pipe for. Churchwarden got me onto Old Toby which is a fun smoke. It's a little sweet but very nice for a late night snack.
I agree with whoever it was that said he could smoke anything anytime in his cob. I have a number of MM cobs and they are amazing. I have seen several here that say that all they have are cobs and never have to worry what they put in them or how often they are smoked. I have some very nice briars but if I could only have one pipe it would probably be a MM General.