Add comparison to BIP-118 in BIP-448

The recent discussions and technical comparisons between various Bitcoin Improvement Proposals (BIPs) highlight the nuanced differences in their applications and potential impact on Bitcoin's functionality. BIP 448, as detailed in its documentation, positions itself by comparing features with BIP 346, which relates to OP_TXHASH, and BIP 119, known for CHECKTEMPLATEVERIFY. However, it notably lacks a comparative analysis with BIP 118, SIGHASH_ANYPREVOUT, which is crucial for understanding the full landscape of recent BIPs.

Exploring the specific applications enabled by BIP 448 versus BIP 118 reveals a fundamental divergence in their utility and target use cases. BIP 448 is not directly compared to BIP 118 in existing literature, leading to discussions among developers and contributors on platforms like the LNHANCE thread. The primary critique of BIP 118, as outlined in these discussions, centers on its specificity to covenants. This limitation suggests that while BIP 118 is potent within its niche, its applicability might be too narrow for broader adoption or different contexts where more generalized solutions are preferable.

These insights into the development and evaluation of Bitcoin protocols underscore the importance of thorough comparative analyses when assessing new proposals. Such evaluations not only clarify the technical capabilities and limitations of each BIP but also guide developers and the community in making informed decisions about which innovations will most effectively advance the Bitcoin ecosystem.