The "enshittification" of computing. The Windows 11 default Photo Viewer has probably 20% of the features of IrfanView - and the problem is that normal users don't know a better tool exists for free if they need those extra features. As the resident techie in my house I get asked by people to do simple things like overlay text in a certain style or print a photo with a particular resolution or print multiple photos etc. and these tasks are just harder or impossible with the default tools
I'm guessing even if they knew the tool existed they would still rather ask you to do it. Not everyone wants to understand computers or download programs