It depends on how sensitive your senses of smell and taste are.Do you have different pipes for different tobaccos, or do you use the same pipe for all tobaccos? I know some have dedicated pipes to just one blend or type, such as aromatics or English. It seems others don't. Personally, I have my favorite pipes that I smoke all my blends in. I might not get a pure taste from the tobaccos and if the pipe is ghosted it will impart a taste from another but to me that just adds to the experience.
So, what do you guys do?.
If, as you say, you don't mind if your pipe is ghosted from a previous smoke, or you find that it adds something to a subsequent smoke, then by all means carry on doing as you have been.
I find English/Oriental and aromatic blends ghost and diminish/detract from subsequent smokes.
I don't have specific pipes for a specific tobacco.
But I have pipes for English/Oriental blends and pipes for aromatics.
Of course it is much easier to dedicate pipes to specific genre of blends if you have lots of pipes.
But I wouldn't encourage an attack of PAD just to justify that