This kind of company does not want "juniors who could independently own products end to end without handholding", they want do-it-all people on the cheap. They just don't know what it takes to do things the right way. It's not unusual that the organization is a mess as well, because management is unable to organize it.

Get out of it, this kind of companies have a dysfunctional management. After the initial learning, they will be unable to recognize your value and contribution.

Also, don't feel guilty about getting burnt out. It's not your fault and you got tougher.