If you have that option. Not sure if you've shopped for white goods recently, but the options without wifi are relatively few, and mostly lower end models.
We needed a new stove, I wanted one without wifi/internet connectivity. Due to the above and supply chain issues that limited availability of a lot of models, I didn't have a choice and ended up with a model with wifi/internet connectivity. I have, of course, not connected it.
You still have to specifically choose a Wifi one. (Though again, I can see if availability issues might throw a wrench into that if you needed one right away.)
.... What does the associated app do?
The first one we had, we had for over 20 years until it broke down.
If I can only get an IoT-thingy, I'll refuse to buy one and either repair the old one or wash by hand.
I am a green-nut, so I try to minimize my eco-footprint, but enough is enough and I draw a line when my dishwasher needs to phone home.
What software update could it possible need? A better algorithm for dosage?
At some point the repairs/parts cost more than what the original dishwasher is worth.
Regarding the algorithm, I'm not sure they make a huge difference anyways. FWIW, The Technology Connections channel on YouTube has a couple of pretty interesting videos on how dishwashers work and how to get the most out of them: