[K0SM0S]

"Boring" is subjective, and even objectively defined it can't be measured. Therefore yes IMHO, F# qualifies as 'boring' for you.

However, unless you're an isolated entity (e.g., SOHO) or fully remote, your business environment also factors into that equation. Node.js might be 'boring' in the USA but anecdotal (read: edgy) in entire subcontinents.

Economically speaking, a 'boring' tech stack is one that generates the least 'friction' for its devs. (friction may be construed as added cost beyond base material requirements, eg. time or complexity added by bureaucracy, or cognitive toll induced by steep-n-quirky learning curves, as opposed to the fastest road to MVP / RC / shipping).