Up until a few months ago I would agree with your sentiment here, but at the Build press conference the production staff straight up said they'd been listening to (presumably Japanese-only) fan feedback saying that the show wasn't recognisable as "Kamen Rider" anymore, and that's why Build had incorporated some more classic ideas (the victims of Foust experiments visually referencing Riders #1 and #2's cyborg surgery, the increased bike action in early episodes etc).
Of course it could be a one-off example, who knows? Toei do tend to keep the "mainstream" stuff and the "for fans" stuff separate. They got burned on things like the Gavan movie where kids proved to be not the slightest bit interested. But I feel like in the last couple of years Kamen Rider (as a franchise) has been trying to grow and provide content for both of these groups.
I haven't stayed up-to-date with Kamen Rider Build or KyuRanger, (Seriously, I saw the 1st episode of Build before I suddenly got buried in a ton of work that has been hogging all my computer's free space for weeks.) but I have heard good things about Build, so hopefully there is that. I'm still a bit skeptical, but that's mostly because I know how, at the end of the day, this is still a business. And in a business, even if you've got someone passionate about making these stories and honoring the franchise, anything could happen to make the quality of a show dip. Corporate meddling, actors suddenly leaving, sudden change of staff, etc. Not to mention, I've seen moments where stuff like this happens for all the wrong reasons. I've seen show runners desperately throw in fan pandering to please the fans as if say "Hey! Remember this? Here's that thing you love!", but they have no idea why we liked it in the first place, so the pandering they include comes off as hollow and meaningless.
Sorry if my comment comes off as a bit to negative. I don't mean it to be. The truth is, personally, I am pretty easy to please. I don't hold too many standards these days. If my standards were so high that I couldn't accept "Riders without scarves", "Riders that aren't cyborgs", or even "Rider shows that weren't made by Ishinomori"'; then I would have stopped watching a long time ago.
And if I were to put a more positive spin on things, I am hoping that moving Rider and Sentai to a later time in the day means that more people will be watching, and more people will want the show to improve in quality. Sometimes ratings can be just as important as merchandise sales.