If you're just plumbing that hose/barb/olive into another lever or caliper, go for it.
Warranty replacement of a GRX shifter....now I can't remember if there was an olive already in the assembly the first time I fitted it a year ago.
Edit: It does....
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@Stoo61 started
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If you're just plumbing that hose/barb/olive into another lever or caliper, go for it.