Two weapon Fighting is rightfully considered the weakest fighting style in 5e and for good reason If i might say so.
The problems it has is the following.
1) It eats the bonus action when there are several superior ways to spend it.
2) It scales badly with the number of attacks but scales nicely with damage buffs. A fighter with a large number of attacks doesn't get as much bang for their buck as a paladin or ranger or even warlock.
3) It is clearly vastly inferior to dueling style polearm master with spear. It has lower damage output and ac.
Thematically it fails to address the following.
1) It was considered a highly technical skill, everyone can do it decently in 5e and its feat is the weakest of all combat feats.
2) It was more often done with a longer and a shorter weapon. Rapier and dagger was relatively common, far more common that two shortswords for example.
The problems it has is the following.
1) It eats the bonus action when there are several superior ways to spend it.
2) It scales badly with the number of attacks but scales nicely with damage buffs. A fighter with a large number of attacks doesn't get as much bang for their buck as a paladin or ranger or even warlock.
3) It is clearly vastly inferior to dueling style polearm master with spear. It has lower damage output and ac.
Thematically it fails to address the following.
1) It was considered a highly technical skill, everyone can do it decently in 5e and its feat is the weakest of all combat feats.
2) It was more often done with a longer and a shorter weapon. Rapier and dagger was relatively common, far more common that two shortswords for example.