GIMP changing its name seems pointless at this point, especially because of where the conversations there led. It would have been smarter for them to argue that "gimp" is a sexual term, and therefore gross, rather than an antiquated ableist term, because the former is more common than the latter usage (which is never used).
Reiser's accomplishments are already out there, there's no need to continue with his name on something he hasn't contributed a patch to in a decade, and there's literally no harm in changing the name of a program like this; it's not a binary decision between "remember the person" and "use their work," plenty of people have their work utilized despite no one knowing their name. I think that's fine.
I think the "antiquated ableist" form is used for GIMP, but more as a verb than a noun.
"FooCorp will gimp the 700LC with a 30-watt power limit, ensuring it won't compete with the full-performance 700.".
I'm not convinced by the long term benefit of nitrogen fertiliser synthesis. A significant boom in food production is attributable to it but also long term degradation of agricultural soils, pollution from fertiliser run off and repression of more sustainable agriculture and food distribution options. Perhaps if it had been used to buy time for more ecological and equitable policies it would be more impressive, but it seems only to have advanced the alternative.
Have you heard of Glimpse Image Editor? https://glimpse-editor.org/
That said, we also need to be able to separate the good and bad people do. Reiser in his capacity as a programmer is really a different entity to him in his capacity as a murderer. Celebrating one is not celebrating the other.
It is the stereotypical example, but it is such a good one that it deserves to become a cliche. Fritz Haber was sufficiently evil that apparently his wife committed suicide because of him. The Haber–Bosch process is probably one of the greatest technical contributions to humanity, ever, full stop. Maybe the steam engine can compete or a handful of other things. We can't allow technical excellence to be shunned because the technician had horrible problems - the shunning lessens us all. We can afford for bad people to be remembered if the price they pay is to create something of great use.