Yea, dunnit, move on, there's more to see elsewhere ...
I bought my daughter a tablet four years ago, myself three years ago and my partner two years ago. I guess that puts us ahead of the curve for most families in the UK. The prescient point is we still all use the original devices. We have no plans to replace unless they break.
My use of mine (10") has decreased - it has got sandwiched between a 5" phone and a 11" Chromebook. The phone is always to hand so it is seldom worthwhile trying to remember where and when you put the tablet on charge. If you do need a bigger screen or actually need to type something then you might as well go get the Chromebook.
Tablets are great but so are all mobile devices. Their importance has diminished and most of us have got one already. So I do pity the salesman.