Is color contrast supposed to improve readability ?

[Glideh]

I'm often defining specific primary & secondary colors for my applications and I sometimes run into this issue:
The deduced (contrasted) font color seems to make the result less readable in a light theme.
Here is an example:

$primary: #147FAE;
$secondary: #FE5000;
@import "~bootstrap/scss/variables";

<button class="btn btn-primary">Valider</button>
<button class="btn btn-secondary">Annuler</button>

Seems (at least to me) less readable than this

<button class="btn btn-primary text-light">Valider</button>
<button class="btn btn-secondary text-light">Annuler</button>

In that case, I can still override all my element foreground colors

.btn-primary {
    color: $white;
}
// ...

Is there a simpler way to do that ?
Maybe overriding contrast-ratio() ?

[Glideh]

I just found out it seems to be much simpler, setting:

$min-contrast-ratio: 3;

This behaves better for me.
Thx for exposing this variable !