Well I have something like 10 years of sub-d modeling xp, and 2 years of MoI.

For every new project coming on the table, I still need to think about it ... what I gonna use, MoI, Modo ? Both ?
The choice is often difficult, some part will be fastest in MoI, some parts easier in sds. What about the fillets ? Do I have to use displacement on some surface ?

So yes, your 3 tubes and a sphere example perfectly match MoI strenght. A tool like Meshfusion, despite your over reacting perfomance, will probably make the speed modeling difference less obvious.

You know some people will do your modeling exercice in Zbrush in a couple of minutes too ... dont ask me, I still dont get the purpose myself, but for them, it's a valid workflow ... so no, nothing is dead.