Plenty of growers have sucessful harvests using only a measuring cup for nutrients. Others struggle to keep their plants alive through another night using every gadget known to horticultural science.
If you have an affinity toward gadgets and data and stuff like that, then by all means learn their applications and practice their use. To me, measuring pH and PPM is very important. But that’s not to say it is 100% necessary. A PAR meter can tell you if you are getting enough light, but again not necessary. CO2 monitors, thermohumidigraphs, anemometers, moisture probes, even refractometers to measure brix. All useful measurement devices that perform specific functions that are not VITAL to a successful harvest. You’ll probably never say “Good thing I had that CO2 monitor hooked up, otherwise this grow never would have made it to harvest!”.
It’s the same thing with drying and curing your harvest. You know that if you stay within parameters you will end up with a dried and cured product. You also know that if your buds are too moist for too long that you are susceptible to mold. Using a hygrometer will let you know when you are within or exceeding those parameters, which in turn can help ensure a successful cure. But, you can still fail miserably even with a hygrometer. Nothing is a guarantee.
If you have the budget and the interest then you could use those devices to “enhance” your growing game, and probably come out the other end having earned a greater understanding of the many different aspects of your grow. At the end of the day it’s up to you to go where your interests, curiosity, and search for knowledge takes you.