If you look at the output of the launcher, you will see that the outputs of No rx approach & Rx approach (with IntentAndReceiverProxy) matches irrespective of whether the underlying executor used is Vanilla executor or Exception tolerating executor; However, it is not the case with Rx approach
No rx approach; Vanilla executor
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Received by highest priority receiver
Cascaded till lowest priority receiver
Rx approach; Vanilla executor
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Received by highest priority receiver
Cascaded till lowest priority receiver
Rx approach (with IntentAndReceiverProxy); Vanilla executor
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Received by highest priority receiver
Cascaded till lowest priority receiver
No rx approach; Exception tolerating executor
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Received by highest priority receiver
Rx approach; Exception tolerating executor
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Received by highest priority receiver
Cascaded till lowest priority receiver
Rx approach (with IntentAndReceiverProxy); Exception tolerating executor
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Received by highest priority receiver