why class minorid is 16 bit only

Linux Advanced Routing and Traffic Control

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in tc classes, a class has a major id and a minor id. Both are 16 bit.
This limits one to have max 64K classes and if more are needed then
one need to define qdisc below another qdisc and then have another 64K
classes. But as its qdisc below another qdisc, performance is degraded
(more delay).

Will not it be better if we split it ( MajorId : MinorId ) into 8:24
instead of 16:16?
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