Aikido is not a good primary martial art to study, but can be ok to supplement other martial arts as a secondary martial art
Hapkido and Aikijitsu are more oriented to combat and self defense.
Aikido can be a good secondary martial art if you want to learn to not hurt the opponent as much as you would using some aikijitsu techniques
This person explains the problem with moving backwards in some situations
https://m.youtube.com/watch?v=WKVHW-rUAG4