I would go further than this.It isn’t built to deal with western style boxing, that’s for sure. It appears to rely on countering the striking found in Kung Fu and Karate.
As we're discussing technique I'll separate the body conditioning and the Jujutsu aspects (= looking at aikido drills/kata as a delivery system). The caveat is that body conditioning and principles are actually the core of the art, nothing prevents you from using them with a more effective delivery system (e.g. judo), I know some people do.
Aikido is mostly Daito Ryu aikijujutsu (DR). The creator of DR was an excellent swordsman with a lot of experience in sumo, who wandered around the country to challenge martial artists and cross-train. At that time, there was little to no striking knowledge in Japan. Traditional Jujutsu was practiced in the context of armoured fighting, where striking makes little sense. Karate made it quite late to the mainland and was certainly not widespread while Takeda was creating DR. Same with Kung Fu and boxing. Also, most men did sumo to some extent and consequently street fights, or more exactly the "cultural idea of fighting" looked more like sumo than, say, boxing.
Many aikido techniques were just taken from traditional Jujutsu styles that Takeda encountered and imitated (e.g. kote gaeshi). The others he made up. So aikido mostly has either techniques coming from an armoured fighting context or techniques coming from a sumo context (at best).
You can see it from the strikes, for example, which could represent sword strikes or sumo slaps and thrusts. Yokomen uchi is sometimes referred to as equivalent to a boxing hook but the trajectory and elbow position are different (and thus aikido responses to yokomen uchi lose applicability against an actual boxing hook). But it makes more sense if you think of it as a sword strike or a sumo slap (the downward elbow makes sense in a sumo context because that's consistent with sumo striking technique and it's also safer when grappling is involved).
Finally, I think that both Takeda and Ueshiba had other goals than putting together a coherent curriculum of techniques to use in a fight. They saw the value elsewhere (e.g. in the aforementioned conditioning).
I hope this helps.