Why are the various Fard prayers a particular number of rakats; for instance, why is Fajr just two, all of the other four, except for Maghrib
Because we pray the way our Blessed Prophet prayed, and that is
the way the Prophet Muhammad ﷺ was taught Salat by Sayyidina Gibril.
Also, there are many great open and hidden blessings in the way we pray:
standing-bowing-prostrating-sitting etc., the number of rakʿats, the
supplications we say, their words and numbers, etc. Among those blessings:
healing of the heart, mind, and body; taming the dragons that nest in the
breast; purification; concentration; discipline; connection with our Lord
and the Highest Assembly, the angels; obedience of our Prophet; oneness
with the Believers; rehearsing thanks and adoration of our Lord; placing
our hopes and fears in His Hands; obtaining forgiveness; losing oneself in
His Highest praise; acknowledging that we are nothing and only He remains;
surrendering to His will....
© FG Haddad