Even Qualcomm doesn't support its chips for that long. Moreover going beyond the marketing promise will be extra strain on hmd's limited resources. I don't see any reason why they will do such an extended support. Maybe they'll do security patches if they want to.
What you don't understand is that developing and testing industrial firmwares costs millions. Somebody has to pay those money to HMD.
It's not like homebrew firmware, wherein if it works for you fine, if not fill a bug report and wait till somebody can address it.
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