What has changed about it?
See what
@S209 posted a few posts up and watch the videos
https://www.youtube.com/@crckosher or at least the introduction one.
https://www.star-k.org/articles/articles/keeping-kosher/beverages/1142/knowing-your-beans-the-kashrus-of-coffee/
Compare this
And this
To this:
https://www.star-k.org/articles/kashrus-kurrents/6017/when-you-can-drink-and-drive-the-halachic-implications-of-drinking-coffee-on-the-road/
It's inconceivable that Starbucks is the first coffee shop ever to wash parts from the coffee brewer with trief.
Starbucks in Target for example, shares a dishwasher with Pizza Hut. they are probably the first coffee shop in history to systematically wash the brew basket with meat treif keilim. In fact, most coffee shops never wash the brew basket at home, other than a quick rinse. Definitely in those diners of old mentioned.
I drink a lot of coffee, and appreciate good coffee. there's no reason any frum yid shouldn't stick to the americanos and latte's a that are muttar, and not get involved with bedieveds. And its pashut to me that 7-11 or even possibly mcdonalds is a safer bet.
As far as Maaris Ayin, Rabbi Heineman is not the only major posek to feel that way. However, as with all maaris ayin, once everyone does it its not maaris ayin anymore (I acknowledge the oversimplification). But at a rest stop there would be substantial reason to be meikel as well, which is the Star-K's premise in 2019. In 2023 when every starbucks, including the kiosks, has hot treif meat, it's a whole different shaila.
Again, watch the videos and make your own judgment, but don't shoot from the hip, and heteirim from a year ago are no longer relevant