  A recent paper by Gupta et al. (EuroSys'23) challenged the usefulness of
trusted component (TC) based Byzantine fault-tolerant (BFT) protocols to lower
the replica group size from $3f+1$ to $2f+1$, identifying three limitations of
such protocols and proposing that TCs should be used instead to improve the
performance of BFT protocols. Here, we point out flaws in both arguments and
advocate that the most worthwhile use of TCs in BFT protocols is indeed to make
them as resilient as crash fault-tolerant (CFT) protocols, which can tolerate
up to $f$ faulty replicas using $2f+1$ replicas.
