I can fight properly. I'm very handy with the L85 and the variety of pistols I'm meant to be able to shoot people with.
There will never be a situation, ever, where I'm going to have to lead a section battle drill. It's completely, utterly pointless.
My training took something in the region of 6 years. Why expand it with something outwith my job description, which I'd then have to practice to keep current? My actual job keeps me busy enough, and the annual CCS top-up is more than enough.
By your reckoning, why don't we train all Army officers to steer submarines? And why can't all Naval engineers also train as Typhoon pilots?
I'm a specialist (regardless of what they tell me!), and I'm happy being good at my specialisation. If you believe that being a military officer starts and ends with section battle drills then you're very much mistaken.