What is the strongest broad-spectrum antibiotic at present? What's the big deal?

For example, daptomycin and linezolid used to treat G+, or ceftazol -avi and ceftorazan/tazol, are only used for patients who encounter drug-resistant bacteria or are very difficult. The R&D market of antibiotics is very embarrassing. In recent years, large pharmaceutical companies have closed their antibiotic departments in R&D. Why is the antibiotic housekeeper not allowed to use it? The control of antibiotics in hospitals is tight, and the number of patients is even more difficult. It has led to the development of R&D in recent years. D can't keep up with the speed of bacterial mutation, so there is really no way to meet drug-resistant bacteria like Xiao Qiang in clinic. The FDA has to extend the service life of patents. So, don't mention the strongest antibiotics, but think about how to optimize antibiotic treatment. Penicillin from acid and mildew resistance to broad-spectrum penicillin ampicillin, cephalosporin from the first generation to the fourth generation, the antibacterial spectrum is basically more and more extensive, which can be said to be strong in the middle. But what about this? The magical height is 10 foot. Too much will only produce more drug-resistant bacteria, so what we need is not the strongest but effective.