Hi
Times have changed, in particular with chicken.
They are now produced in huge units, 200 to 250 thousand birds, and from day old to slaughter is 5 weeks, which is not natural.
Disease transmission is much easier and they then go to industrial sized killing and processing plants which handle millions a week.
Again, disease transmission is very easy and affects far more birds even after a simple fault.
Antibiotic resistant bugs are common now, and the type of food poisoning has now changed.
Camphylobacter is more common than salmonella and certain varieties , such as jejeuni can be transmitted from the packaging.
Jejuni can cause sepsis, which is not what you want.
Ready meals etc?
Packed in nitrogen, which stops the bacteria growing, so can be reheated.
Do you have nitrogen in your kitchen?
You cannot safely batch cook without a food thermometer to test time and temperature.
I do buy damaged free range chickens from a local processor.
The free range bit is important,.
I butcher them myself, package and freeze the meat into a meal for one and then cook them as and when.
The rest of the carcase I use to make stock, but I will not freeze it.
Times are changing, the old rules do not apply.