DotNet 10 allows me to create a single web application for all three major platforms, and to ship it with the runtime baked in. This allows me to host said application anywhere I want.
If talking about non-web desktop/mobile software, the big issue comes down to GUI framework. Maui is optimized for mobile, Avalonia is superior on desktop. But other than that, thanks to the baked-in runtime it is becoming trivial to build a single GUI program and have it just run anywhere without significant rework.
Plus, C# has become an absolute pleasure to work with, and makes Java look practically obsolete. Hell, Java had to roll back its own implementation of string interpolation in 2024 because they just couldn’t make it work. C#? Working beautifully since 2015, and improved several times to even greater effect.
And if C#’s functional programming rustles your jimmies, you can easily use F# in the same project without complaint.
Finally, while Blazor webassembly might not be entirely ready for world+dog prime time just yet, it works great in an intranet where thick pipes are guaranteed, allowing me to give a hearty middle finger to everything JavaScript.
Honestly, while I will always evaluate every project to ensure that the programming platform is the best one possible, and have chosen other languages for good reasoning plenty of times. But anything which falls in the “anything will work well enough, generally speaking” bin has me reaching for DotNet almost every time.