My personal experience ... I BF for 18 months, DS2 was BLW from around 6 months'ish (can't remember exactly). He loved food, would chew it, gnaw at it. I made sure he was getting a range of veg, fruit, protein, carbs in front of him and beyond that, it was up to him. He enjoyed it, still loves eating with his fingers at 2!
I always BF him before food until he was about 8 or 9 months, when he really 'got' eating. That way, he was never starving or desperate for food, he just enjoyed trying what it was like. For us, he was eating pretty quickly though, as his nappies changed quickly, so I knew he was getting something down.
Certainly not malnourished.
BTW, formula milk contains more iron than BM, BUT the iron in breastmilk is absorbed much more easily. A lot of the iron in formula just passes straight through. Also, guidelines is to breastfeed for 2 years I believe.