But I think that's a charged word and personally I would reserve that for other female character deaths in Kamen Rider which really are atrociously undignified.
I see where you're coming from and I'm sympathetic. You've inarguably got a point that Tackle's last battle is far more interesting than basically anything any subsequent female Rider has ever done. Personally I'd much rather see a resurgence in effective heroine assistants like Tackle (or Diana from Spielban, she was rad) in Rider than more basically useless lady Riders like Femme.
I suppose if you've got a real feminist agenda, all that matters is if the trope was invoked. I'm a bit more ambivalent about applying firebrand feminism to analysis of pop culture, myself. In Tackle's case, I do think it was a fridging, but I don't think it was necessarily a bad story because of that. I think it was an
archetypal story, but there's a place for that in superhero fiction, handled well and carefully.
The real value of pointing out the Woman in Refrigerator trope is simply to say, "Why must this archetype be invoked
all the time?" A danger with praising Tackle's story is that, for Toei anyway, it sets it up as something worthy of being emulated. The lesson Toei really should be taken from it is "Done that, let's move on."
I think this is relevant enough for W-- relative to some other tangents the thread has had-- since W is the first Rider show in years where female characters have been allowed to accomplish much of anything. I also wouldn't be entirely surprised to see Akiko become sort of heroine assistant in her own right before the show ended.