Do you think it'll be helpful to be better at the "CTO"-like role that an indie hacker needs to build a Micro-SaaS?
No, I'd think you need employees - or people in the company to interact with. If you're solo (I'm solo for my next adventure), it's not for you, don't spend the money.
But one should write a solo guide with tools etc.
"Numerous books cover architecture and processes"
Does anyone have recommendations in this area as well?
Wrote that for several years from my experience.
no hard copy?
No not yet, self publishing, most print-on-demand has bad quality,
there will be a hard copy in the future if I figure something better
than my last time (printing in Poland, FBA at Amazon)