I know Wilwood offers a line of brakes that do have dust boots.
I'm no brake expert but I think you might find that the highest performance product offerings from several brake companies utilize seals vs. dust boots. I'm sure they have good reasons for doing so.
Of course, each person needs to select the parts that best meet their specific needs and purpose. No one design is necessarily better than the other until the use of the product is considered.
OEM applications typically use dust boots so I would guess the reasons you want dust seals mirrors what the majority of people desire for their applications.
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