Nobody, nobody, nobody cares about old hardware, performance, users, etc.
if anyone cared, React wouldn't be a success. The last time I tried to use the react website on an old phone, it was slow as hell.
I think Let's Encrypt made a heroic effort. They deployed a hack to support Androids long abandoned by the operating system maintainer and manufacturer. If you want to blame LE for the breakage then also blame: GOOG for using the IBM PC clone business model without a device tree standard, QCOM for selling chips but very quickly cutting support, the manufacturer, and cellular carriers who prefer to lock you into another 24 month installment plan than approve an update for your existing handset.
React is successful because of the tech/VC bubble, not because it's some miracle technology.
The actual websites where React is useful can be measured in single-digit percentages (effectively a full-blown application requiring a desktop-like experience, think a trading terminal). It is overkill for everything else.
LetsEncrypt is stopping serving Android 7 this year. Android 7 will be blocked from 19% of the web: https://letsencrypt.org/2023/07/10/cross-sign-expiration The option is to install Firefox.
Users with old hardware are poor people. Nobody wants poor people around, not even using their website.
“Fuck the user”, that's what we heard from a PO when we tried to defend users, imagine if we tried to defend poor users.