The reason I've avoided Intel since Sandy Bridge is their security. Sure things like Spectre and Meltdown don't really affect me as a home user in terms of security but the loss of performance due to patches for those does. Buying Intel i would be always afraid of losing performance over time.You'd be a fool to buy Intel period. One 5% IPC CPU upgrade and invalid motherboard because Intel wants to force you to buy motherboards with a dozen Intel branded chips whereas you could literally go from some A320 and upgrade all the way to a 5800X3D. Only a fool would willingly give their money to someone who blatantly and known-to-all rips off their own customers.
Unfortunately barely anyone tests performance with and without patches. Sure AMD does have the same issue but they always seems to be less affected both in terms of number of vulnerabilities and the performance impact of patches for those.
AM4 longevity is just icing on the cake.