Ian Dodkins wrote:
We learn techniques, but we are training to be fluid and responsive and to be able to change and adapt whenever resistance is encountered.
Afaik this is exactly what "resistance training" in Aikido is supposed to do. If one is fighting the resistance then they are doing something else or extremely poor Aikido.
Also there are a few psychological and physiological (at least internally) commonalities between competition and combat. Much has to do with how the human self operates when under severe pressure of intense, unexpected resistance and or a threat of endangerment situation.