Cognite Software Engineer interview questions

Hello, I passed first coding test step then I got technical interview. It was live-coding. I solved both of 2 problems very quickly using my logic. I used 2 different data structures + stream structure without looking anywhere. My alghoritms complexities were low. They asked me to change if-else blocks and put something else. I said we can use also streams filter qualification. I am only 2 years experienced software developer. I asked about what points I need to improve myself but I could not have a detailed expression about my eliminated. Actually this makes me sad because I dont think that i am insufficient regarding my experience.