It really is. WebASM is miles beyond what you're probably thinking of in terms of browser based performance, and most companies these days do not have local applications installed for their office workers. Office 365 is by far the most popular version of office, and it's entirely browser based. Most in-house corporate IT work from the last decade is electron wrappers of internal company websites acting as simple interfaces for actual heavy lifting.
While there's definitely some apps that are a bit too heavy for WebASM (or just javascript/.net for the above examples) this list is vanishingly short these days. I'd say blender and other 3d rendering would be inefficient just because WebASM has weird interactions with anything other than OpenGL and Vulkan, But even Unreal 5 can export to WebASM and do it fairly well (as well as OpenGL can perform, that poor outdated thing).
Heck just go to itch.io or any website that has ported over games to WebGL/WebASM. You can run Half-life directly on your browser these days. Half Life of all games. That's more demanding than anything not 3d that you'd run in an office.