It doesn't have to be used for every patient, and it doesn't have to be kept around waiting for Doctor House's third act. There is nothing stopping you from a middle ground.
/s
1. Take some blood to send to the labs to grow bacterias
2. Only then IV of antibiotics
3. Adjust at day 3 when you get the results.
And what if it looks super severe en urgent? Then 1. we do that too because it's often impossible to know what the pathogen was once you IVed all the antibiotics. And 2. we start by wide spectrum super strong high dose antibiotics.
Example: purpura fulminans: 1g of 3rd gen cephalosporins.
Ymmv in other countries, especially the USA because IIRC you have selected tons of emergent pathogens.
Also because you're still with us so it probably worked.
In any case I'm glad you're better and sorry you had to go through this.
Who cares if they need to charge $30k per patient to use it if that fast knowledge saves the patient’s life. It doesn’t need to fully replace the existing methods, but could be a useful supplement when a patient is in critical condition