What are the actual problems with end$-$consumer IoT systems?

a$.$ short lifetime due to limited product support,

b$.$ short battery$-$life,

c$.$ complicated configuration,

d$.$ limited standardization of protocols $($war of standards between companies$),$

e$.$ forced high dependency of local IoT system on manufacturer cloud system,

f$.$ short and limited tests of the product by the manufacturer,

g$.$ lack of standards and very limited guarantees related to data and consumer health safety.