Because many foundries are located there like GlobalFoundries and Bosch
(Also such a large economy can offer better (aka larger) subsidies if they want to)
It's probably good for the EU in general to have multiple silicon hubs.
although imo Eindhoven isn't exactly the most... attractive place to live for many people. Dresden on the other hand seems like it's somewhat en vogue
Because many foundries are located there like GlobalFoundries and Bosch