Impala, on this board, you will find that different people have made different decisions on common issues. Though they often differ from my decisions, they usually have a logical reason, at least in their own minds, and it generally works for them. So far.
Battery issues is one of many such issues.
As you noted, some test and keep driving a battery. I need high reliability because at times, I am in isolated places. So, I replace my batteries at 5 years and don't care how it tests. Others do the same. My son-in-law lives in Southern Texas, and he normally gets less than three years out of his batteries.
So, you will need to read what people suggest, almost all viewpoints have their own merits, and then make up your own mind.
My viewpoint was based on living in the Snow Zone, and batteries tended to fail when it was very cold, and I needed a battery more than usual. By the time I bought a new battery at maximum price, and missed work, and maybe had to pay a taxi, I said to heck with it, that cost more than a new battery would cost in the first place.
Or, if I called a tow truck to start me, there was hours of waiting, because all old batteries seemed to fail that day.