Ferrari making all of the parts of the car they can is not about nationalistic pride, it's about control.
They make a luxury product and want to control everything about it.
Ferrari's pride has always been engines and an electric engine is made by motor+batteries.
Of course compromises are made, of course they don't manufactur absolutely everything, but Ferrari batteries are a plus for premium customers, just like Tesla batteries are what people buying Teslas want in their cars
People owning Ferrari also own the leather bag set specifically made to fit that model.
An example
https://www.ebay.co.uk/itm/174824008379
of course made in Italy, Schedoni is based in Modena, where Maranello is.
It's part of the experience.
Apple is considered the Ferrari of computing because the majority of their customers only own Apple devices and accessories and wouldn't want anything else, especially if they are cheap off the shelf alternatives.
They live the Apple experience in full.
And Apple can offer it because of vertical integration, they are making their own CPUs for the same reason.
How long did it take to Apple to make it happen?
If Ferrari starts assembling core components from multiple retailers, it's not a unique custom made piece of ego anymore (and a show off of incredible crafting abilities if you ask me, a piece of art some would say), it's "just a fast car"
I hope I've explained myself better.
Anyway, I also think that the argument is somewhat silly from Italian politicians, but I can understand why they are pushing for it.
Nothing says made in Italy more than a Ferrari.
It's the most popular Italian brand in the whole World.