Inrush current management for offline SMPS <75W

[cupoftea]

Hi,
The below shows inrush current components, but as yet, why do we still not have proper inrush management ICs for <75W , 90-265VAC
offline SMPS's? One still has to do it with expensive discrete components and an (expensive to get programmed) micro.

https://www.ti.com/lit/an/slva670a/slva670a.pdf

Supposing , for 240VAC input, your inrush relay shorts out the inrush resistor after a suitable delay (it has to be delayed because the
"PSU enabled" voltage has to be low enough for 90vac). All is very well, but then supposing the mains suffers a dip down to 100VAC for 5 minutes....
and then suddenly returns to its correct value of 240VAC..then the inrush relay will still be shorting out the inrush resistor when the mains
recovers back up to 240VAC.....and so you then suffer massive unlimited inrush....and you either seriously weaken,
or nuisance trip, your mains input fuses...and your entire equipment
no longer works. -And yet still, we have no ICs to manage this. Do you know why?

 

[BradtheRad]

Many threads here present a project that resorts to an NTC thermistor for inrush management. Half the time the thermistor is creating the problem. Whatever makes it work, it appears to be a solution for as long as it works.

To tell the truth, if I were to start work on an IC to manage inrush, I'd have too many decisions to face:
For 120V or 230V? Should it run on AC before rectifying or after rectifying (pulsating DC)? How high maximum surge current should internal components endure?
A-n-d... How likely someone will soon reverse engineer my IC and alter it a bit to avoid patent royalties and sell his inferior IC for less in order to undercut me?