Well, a little later, Toei in Metalder touched on the Japanese role in World War II. Albeit indirectly, gently, and in some ways, comprehensively. Although this show failed at the time, so who knows.
In any case, I think the hypocrisy began when Emperor Hirohito was not recognized as a war criminal and remained on the throne. So, in some sense, the victors allowed the Japanese to turn a blind eye to their own sins.

In the 90s Solbrain would also have an episode that featured some explicit references to Japan's ties to Nazi Germany in WWII. I suppose you could argue that the Metal Hero series was more interested in explicitly exploring the topic, or that the passage of time simply meant Toei was more comfortable confronting that part of Japan's history.

If the next KR season after Zeztz goes a half & half rider like Double and Build, how would you envision it being a music genre themed rider due to the next season being 55th anniversary?

What music genres can fit these riders?

• Zeztz: Dreamwave
• Gavv: Pop Rock
• Gotchard: ?
• Geats: ?
• Revice: ?
• Saber: ?
• 01: ?
• Zi-O: ?
• Build: Hyperpop
• Ex-Aid: Chiptune
• Ghost: ?
• Drive: ?
• Gaim: Hip-Hop
• Wizard: ?
• Fourze: ?
• OOO: Reggae
• Double: Jazz
• Decade: ?
• Kiva: Gothic Rock
• Den-O: ?
• Kabuto: ?
• Hibiki: ?
• Blade: ?
• Faiz: ?
• Ryuki: ?
• Agito: ?
• Kuuga: ?
• Ichigo: ?

[nevermind]

Hibiki would definitely be traditional Japanese music.

It might introduce other problems, but I wonder if Toei could get around the road laws that limit bike action by giving a Kamen Rider a horse instead of a motorcycle?

I think it will only increase restrictions. Bicycles and other similar types of transport, on the other hand, could be a good alternative.
On the other hand, given the numerous examples of the possibility of filming spectacular scenes on motorcycles, it seems to me that the main reason for their reduction is not the rules, but banal laziness and/or stinginess. Directors simply don't want to bother with their filming and do the bare minimum as a tribute to the franchise's history.

Not a bad idea, but I'm not so sure about actual horses all the time, though. That alone is probably gonna be a whole other heap of fees and things to worry about during production, such as extra training sessions for those acting, feeding and taking care of the horses, and we don't know if the novelty is worth it for multiple seasons.
TL;DR: I'm down with having a horseback riding Kamen Rider every once in a while as long as it is doable for Toei.

Ah yes I would love to one day buy S.H. Figuarts Horse.

In the meantime, figma is still available. Not joking, they have actual generic action figures of horses.
https://www.youtube.com/watch?v=0S0ZsFT4lk8

Which is such a figma thing to do, considering they don't just dabble in the realm of fiction, but sometimes make articulate action figures of real-life things or people from Michaelangelo's David to Japanese celebrities like Masahiro Chono aka the guy who always slapped Hosei Tsukitei in Gaki no Tsukai when they had their do not laugh specials .

https://www.youtube.com/watch?v=2gmjYirPp_8

In the ongoing interest of uncovering deep Kuuga lore, I watched this video for the promotional piece that aired on Toei Channel back in late 2000 to promote its home release, but it ended up being more interesting just as a time capsule of what Toei was up to in general in that moment. I'm sharing it here anyway for the sake of anybody who wants to experience the concentrated vibes this thing radiates. Props to whatever random person decided to upload this.

Man, Battle Royale is such a blast from the past. That movie adaptation was, dare I say, the Squid Game of the year 2000. Fun fact, Toei Channel is a satellite broadcasting channel that appears to still be operational these days, and plays all of their anime, tv dramas, and movies, from the widely known to the super obscure.

That all seems very cool but uh, I don't speak Japanese.

Well you probably don't speak Grongi, either, but did you let that stop you from bathing in the atmosphere of their scenes in Kuuga? :p

By the way, YouTube videos are pretty easy to download and translate with subtitles. I watched the Chinese Balala the Fairies that way.