Really hard to know how to respond to threads like this.
I have a 1300Ti with a warm two litre in it. It was in it when I bought it nearly 30 years ago. It has the usual stuff, higher comp, ported head, extractors, electronic ignition, etc, produces around 150+hp depending on the dyno you use. It also has very careful and effective suspension mods not including the Alfaholics lowered nonsense. It looks quite stock, but isn’t. I also have a fairly standard stepnose 1600 coupe.
The result is a quick car - for 1970. Its drives really well, very comfortable and capable in modern traffic, it feels and sounds great but its not a fast car anymore. I also have a 997 Porsche Turbo with 480hp, 500hp with overboost. This is a fast car.
So what is a 105 series Alfa in 2020? Its a vintage car. It’s also probably the best driving car of the 1960s, no small achievement. What they offer is a level of feel and communication modern cars no longer have. If you don’t lower them too much and stick with skinny wheels you get to experience the essence of them and the genius of the engineering.
If you heavily modify them you don’t really get a fast car and you lose a lot of what makes them special. To me its about respect, but, hey, each to their own.