[ShiShiLeo]

Build was envisioned to be the last Heisei era show and was designed to be a "return to the roots" of Kamen Rider. This is because Toei, as well as most of Japan, thought Heisei was gonna end in 2018.

These eras correspond to the reign of individuals who choose to abdicate when they want, so it's not always a clear distinction you can plan around with a
show that operates with a 1+ year lead time.

I also think we'd all be surprised at how the Pandemic impacts sales. Globally, we are seeing people spend more on entertainment and merchandise- things that lend themselves to escapism and nostalgia. Video Games are booming and there is an increased demand for TV shows, Movies, and things to watch/consume. That being said, it's less clear how the Pandemic specifically effects kids toys, as nostalgia is really an adult thing.