Is this just a feeling, based on experience or always repeated internet gossip? I have more confidence (based on experience) in old electronics than in the cheap stuff they build in these days. Also, at least in case of the most sought models like the Xpan, you can still sell it even broken for half the price you paid before, either to people who need spare parts or freaks who can fix nearly everything when it comes to electronic. Me personally, I'm more afraid of mechanical parts which can't be replaced.
Anyhow, I'm almost confident that in 2028 you see somebody shooting happily with his XPan and you will ask yourself why you didn't buy one in 2018.
If you see a nice offer, buy and enjoy. Life is to short to be afraid.
Juergen