Firstly, the absence of crucial debugging information like the preimage or private keys renders these transactions unsuitable for effective testing. Secondly, the utilization of OpenSSL for signature creation in these transactions leads to non-determinism, making them unreliable for tests compared to those created with libsecp256k1.

The inquiry highlights a need within the development community for accessible raw legacy transactions accompanied by their private keys to facilitate software testing. This requirement underscores the challenges developers face in ensuring the reliability and effectiveness of transaction constructors in BIP143, as well as the broader implications for blockchain technology testing environments. Ali's request for guidance or resources points to a wider quest for improved testing methodologies within the programming community, specifically those that support legacy transaction formats with comprehensive and deterministic data sets.