This. We were building an IoT product that was effectively stuck on a derivative of Ubuntu 18.04; we couldn't upgrade because vendor wouldn't rebase on a new LTS for a very long time. As our project was being developed in Python, we were stuck on 3.6, and as it reached EOL, many third-party libraries dropped support and wouldn't even release security fixes; we needed to stay on that particular OS because of hardware support; and moving off the distribution-provided Python packages would increase maintenance burden beyond what we were able to handle.
Even if the vendor would continue to provide security updates to the base OS and its packages, any real-world software solution will rely on third party packages, which may choose to drop support.
I would love it if the lawmakers considered this scenario.