This may be the case for you, but for me I can hardly think of anything easier to reason about in terms of producing a document tree than a pure function over state which returns that tree.
2. An integrated approach to data access and view generation is a god send when you are a lone developer. With the front-end and back-end separated, there is twice the cognitive load to handle, no matter if the languages are same on both ends.
3. Reasoning about a web-app, in terms of views (or pages) is much easier to start with. Of course, we can always complicate the thing by adding JS, but ASP.NET Core MVC provides a very well laid out template to begin with, that is suitable for most web apps.
4. C# is an amazing language to work with. It's mind blowing awesome, especially after working for a year with JS/TS. To quote Steve Jobs, "It's like giving someone a glass of cold water in hell"
5. Async/Await in C# is easier to work with.
6. Expressing Ideas in C# is very easy and systematic.
7. Performance is fantastic. Just see the Techempower benchmarks. Performance is money, in today's cloud world.
I used to be a fan for react, but a month ago I started a project in asp.net core mvc, and am hooked. Of course I have a lot of experience in c#, so that helps i guess.