In my opinion you have nothing to worry about - You may get a slightly faster wireless speed as I assume that's how you are using your laptop with a faster processor but it will be marginal & there are many other things that will affect wireless speed far more such as walls and metal objects..
I use a rather ancient DELL laptop that refuses to die on me with a multitude of connections including BT Infinity with no problems whatsoever. I really can't see why the engineer would even mention it unless you find your speed isn't as fast as your theoretical limit & you were to raise this with BT help they may point this out.
I wouldn’t worry at all - If your laptop connects OK there is nolthing to fix.
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