I like gas fine but not enough to spend $4k (probably more now) to drop a line (given how my house is situated with respect to my gas sources). As far as temperature selection being finicky and changing from pan-to-pan or built in safety features, that's not been my experience. Understanding the different burner sizes is pretty intuitive on my setup. I can slide pans around on sil-pats enough without scratching things up or lift them off the burner if they need a good shake (on mine, the pan has to be off the burner for 25 seconds before it turns off; so that's a non-issue; gas doesn't heat the pan if you remove the pan either). If I want to move a pan to another burner, it's easy, and that burner instantly gives the pan whatever level of power I set when I move it over there because there's no waiting for the surface to heat up and no loss of efficiency. And as far as cleanup, there's no comparison to gas or a radiant-electric cooktop. Mine looks brand new at 5 years old.
Like I mentioned before, you can't beat the shit out of your pans like you can on cast iron grates and keep things looking nice. My pans, though well used, still look good as a result. And a wok that isn't a flat-bottom job isn't going to work, but other than that, my experience in owning one for five years is that it works really well, even if it takes some getting used to. Temperature control is extremely precise, especially on the low end. Keep warm and melt settings work like a charm.
Side note: You do have to bring an empty pan (carbon steel in particular) up slowly because they can warp if you're using a HOB that's undersized for the cooking surface of the pan and you just put it on blast. But you only need to do this slowly enough so that the temperature difference between the area under the HOB and the outside of the pan doesn't vary wildly. Or you can just put the bigger pans on the larger HOB and bring it up a little more quickly. It amounts to a couple of minutes while I'm prepping and is on par with my experience in bringing a pan up to temp on gas.
As far as those portable induction HOBs go, I wouldn't bother. Most are cheap crap with undersized magnets. Which cooktop do your parents have?
TLDR, if you like gas, great. When I first got my induction cooktop, I felt like it was a consolation purchase with an excuse to get new cookware because getting the gas line dropped was too expensive. But it didn't take long to get used to it, and now, I don't think about "upgrading" to gas anymore. That said, I still like cooking on gas, but if and when we have to replace this cooktop, we'll very likely get another induction setup (hopefully one where all of the HOBs have at least 8" magnets).