Answer is simple: I don’t need more than 3 to 5 Inserts. Channel Strip cover basics like compression, gate, limiter and envelope + 6 pre-fader and 2 post-fader inserts = a lot for me.
I’ve had need to use a lot of plugins at the beginning of my journey into sound production but now i can make mix with (dynamic) eq and compression and no more than 4 more inserts for difficult audio tracks. When I’m opening my old projects I’m no wonder that I put 8 insert effects and still have poopies sound 
For experimental/SOund syntesis etc modern instruments have so much options and effects included that it’s possible to make finished or near-finished sound without inserts at all.
But would be nice to see option for modular Insert/Channel Strip where I could relocate inserts between Channel Strip