The reasons go wayyy back IIRC
In the early 1980's we were in need of a small, agile, fighter to replace the Lightning and to cover scenarios where the Tornado F2 would be ... embarrassed...... We had Tornado, Buccaneer, Jaguar and Harrier for strike at the time.The British went ahead with a technology demonstrator, the EAP.
This morphed into the EFA (Typhoon) in 1988. After the fall of the Soviet Union and German shenanigans the whole thing stalled for several years until production eventually went ahead in 1996. There was still a lot of pressure to keep the costs down. The choice of radars was a straight political deal between the UK & Germany to keep Ferranti in business.
First deliveries started in 2003.
It's not surprising that as the world has changed the Typhoon we see isn't what we'd spec today. The addition of a ground attack requirement was never really envisioned over 30 years ago. The design is basically over 25 years old and has been in serial production for 20 years.
That's why, in some roles, it's not exactly what we might want - but it's all we have and it could be a lot worse.......