No. I have not played the past expansion, nearly anything. I am maybe level 20 I don't remember. I uninstalled HS after Diablo Immortal. I was so pissed off with Blizzard for how bad this game went and how they have treated Diablo that I closed everything. I went in this website to check the new expansion, and it is not anything amazing for me (same stupid reprints). I did the subscription with Google Stadia. It is amazing for me (for less than 50 bucks I purchased Red Dead Redemption 2 and Cyberpunk 2077) I will never play anything from Blizzard again.
ouch ! but understandable, this is my final year in HS as well
problem with HS also is, if you stop playing for 6 months, you're almost unable to catch up with expansions, missing so many cards and missing all the gold. at that point as a F4P player it's already too late, and might as well just uninstall and move on ...
My 'final year' was 2018, I stopped playing not too much after Ben Brode left, not because of him but because of the general direction the game was going. I enjoyed Wild back then, new expansions felt underwhelming, Standard was very low powered and boring in general, old classics were getting nerfed over and over or moved to wild, the game had no clear direction.
Now I'm back. I had some old stuff and a bunch of gold so I wasn't really starting 'from scratch' but mostly so, I'm back in the game in under two months and feeling as good about the state of the game as I was around K&C, possibly better. The reason is that most cards actually become irrelevant anyway even for Wild, so the game hard resets every six months or so. I'm not saying starting from zero is the same as having an old account, but leaving and then coming back to a new Standard won't make such a drastic difference in terms of resources compared to just staying through it.
I mean there is an adjustment period where you just play Arena and farm those commons and rares that you need, or Wild for some more gold for the miniset (and more Arenas) but other than that I won't say that coming back now felt worse than starting back in 2014, much easier anyway with a good collection to build upon even when you lack new Standard stuff.