Side note: I see classic Amigas as modern machines, new peecees are simply much faster, but that's all they are, faster.
I could add a few things to the list other than "faster". How about
cheaper
better supported
better modularity
more compatible (consumer devices, network protocols etc)
more operating system choice
more application software choice
These are all tangible benefits for most users. Let's face it, the Amiga as a hardware platform is not modern. It was modern in mid 80's, but every hardware advantage it had has been either surpassed by it's rivals or rendered redundant in some other way (planar pixels were great for scrolling but nobody uses them now). Whatever could not be beaten by elegance has certainly been bested by orders of magnitude increases in performance applied to whatever less elegant solution was used instead.
Try running AROS, amithlon or even just UAE on a current "peecee" and tell me you don't find any advantages at all.