I'm not taking this personally. Android devices have a reputation for the lack of updates maybe two years after rolling out to the market. Some people will Root their tablets and phones in an attempt to force an OS upgrade. Personally, I won't do it to my Samsung Galaxy S7 Edge even after the upgrades stop, but, others might be willing to do it.
Either way, it is unlikely that the tablet in question will receive any OS updates. If receiving long term updates is a desired feature, the choices boil down to an iPad, a Windows 10 tablet, or, periodically purchasing a new Android tablet .