Huh... I remember the days when I was developing an idea in a similar way you did here... I like that you are thinking about all this before even laying down the data on the web!
I'm looking for the blog to be SEO-friendly but not so SEO-ed that it becomes flat and inaccessible.
You noticed very well how this SEO thingy can move us OUT of our general idea... As SEO is a moving target, it shouldn't be ALL about it... I mean, according to "current rules", as rules are changing... I made a couple of YT videos with an idea of growing my YT channel and fell into a similar trap there... Making that title, description, and thumbnail "perfect" with an AI pushed me out of myself... Especially when I tried to "read the script" which AI prepared... That wasn't me anymore, and it showed in numbers too... People didn't like it, SE didn't like it...
I suppose we need a balance between those things... Just like you said... Do SEO, but do not become a SEO-ed content only!
Good luck with your project! The topic is important, and it will be useful to many!
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RE: SEO Planning for a New Niche Health Blog