So did they reduced the amount of attecks for fighter? Why not? In BG3 they do much more damage than any caster.
That is because of broken mechanics/implementation and overpowered gear, not because of 5e rules.
Between a totally broken Haste implementation, multiclass cheese and the ability to use scrolls you already get very strong martial classes. Add to that totally broken overpowered gear and you get what we have now.
Casters benefit from the broken Haste spell as well, sorcerors admittedly more than wizards but still...
