While 100 Mbps is enough for probably the majority of users, it doesn't mean we shouldn't set goals to make things better in the future. Honestly, this feels like the US in microcosm for the last 15-20 years -- "good enough" has become the national motto. Fuel efficiency, electrification, wages, housing, and yes, Internet speeds. It is the fundamental reason that China has positioned itself to eclipse the US in almost every technological measure (though at least we still have our free speech, god, and guns [but this same Brendan Carr asshat is working hard on eliminating that first one too]).
Plus, I'd wager that more than half of the people out there with gigabit speeds are still using some equipment that's limited to megabit speeds somewhere in the chain - a router, switch, cable, ethernet card, or shitty wifi. I've seen that plenty of times (including to myself when Comcast bumped speeds up a few years ago and I was still using an older modem). Unless they do a speed test, they'll never notice the missing bandwidth.
So now I'm much slower in the 100-200MB range, but overall we haven't noticed much difference.
Maybe it was the same with you, and why you didn't notice a difference with Starlink. Are you sure all your equipment was even capable of gigabit? :)