The arXiv preprint (v1, May 2026) reports an InAs/InAsSbP nBp barrier photodiode achieving 2.4 GHz -3 dB bandwidth and 8 GHz -20 dB bandwidth at room temperature in the 3.0-3.7 μm range, with usable SNR beyond 19 GHz on a 121 μm device under weak reverse bias. This experimental result, obtained via standard epitaxial growth on mature InAs substrates without type-II superlattices or cascaded stages, challenges the assumption that high-speed MWIR performance requires complex heterostructures. Earlier commercial InAs and HgCdTe devices typically trade bandwidth for either cryogenic cooling or lower responsivity; the reported structure narrows that gap. A related 2023 Optics Express study on InAsSb barrier detectors documented sub-GHz limits at 300 K due to diffusion capacitance, while a 2024 IEEE Photonics Journal paper on type-II superlattice MWIR photodiodes reached 5 GHz but only below 200 K. The current work’s omission of full noise-equivalent-power spectra and long-term reliability data leaves open questions about integration into frequency-comb spectrometers or free-space links. If fabrication yield scales, the simple nBp platform could accelerate compact sensors for industrial gas monitoring and non-invasive medical imaging within three years, bypassing the cryogenic infrastructure still dominant in high-bandwidth MWIR.