This is definitely true. It seems to be the modern approach that the less effort in development, the better!

I too had code that worked across 3 platforms with wxwidgets and a 3D game toolkit incorporated in opengl for visualisation, with most 2d controls being drawn using wxwidgets OnPaint handlers for custom controls rendered natively on that platform. I wrote this single-handedly, with another colleague handling the network code and firmware on the remote hardware devices.

Everything else is sheer laziness as far as I am concerned. There's even less excuse today with the rise of LLMs to do the majority of UI coding for you.