asymmetric detectors and flavor association

[Toshiro Shisude]

In the LHeC card the b tagging efficiency is defined to be 75% flat over pseudorapidity -6 < eta < 6. But actually it is different from zero only for -3 < eta < 3 due to the previous stanza:
module JetFlavorAssociation JetFlavorAssociation {

set PartonInputArray Delphes/partons
set ParticleInputArray Delphes/allParticles
set ParticleLHEFInputArray Delphes/allParticlesLHEF
set JetInputArray JetEnergyScale/jets

set DeltaR 0.4
set PartonPTMin 0.5
set PartonEtaMax 3.0

This limitation is far too restrictive. Indeed, it is as if in an LHC detector b tagging were restricted to -4.0 < eta < 1.0 instead of -2.5 < eta < 2.5. That wouldn't make a much sense.

In the FCC-he card the situation is somewhat better since b tagging has non-zero efficiency for -4 < eta < 4. But high efficiency (85%) is restricted to -2.5 < eta < 2.5 which, again, for an asymmetric detector is unjustifiably restrictive.

Is there any reason why the b tagging should be forward-backward symmetric in an asymmetric detector in an asymmetric collider?