I'm reading a history book of wine, and it stated that we'd not recognize wine from the Roman era as wine, much less as being drinkable.
I made wine for decades without doing any acid testing, and a few years back I started using test strips. About 1.5 years ago I purchased a mid-range pH tester (about $75 USD at that time), and I do find it useful.
Pre-fermentation it's good to know the pH. I need to read up on how to use the meter to determine TA, which is a more useful number. I have an acid titration kit, but totally suck at using it.
Post-fermentation, I do all acid adjustments by taste. My (tongue-in-cheek) comment is that the pH tester won't drink the wine, so I don't care what it's opinion is.
Also, I keep in mind something I read: The enemy of Good is not Bad. The true enemy is Better.
In that vein I don't chase perfect numbers, and I don't tinker and re-tinker with the wine to make it better. I adjust things (or not) until I like it, then I bottle and do not second guess my decision.