Strange discussion here. I'm a developer in everything for 20 years and the last 7 probably in large JS/TS applications.

I switched to Blazor Server for the last year in a new company and it has a montrous amount of benefits.

First of all, do not pretend that you are Google or Facebook. This is a repeated mental illness that developers suffer from. No won't face any performance issues. The contrary, Blazor is blazing fast.

However, there are couple of issues when it comes to interactivity with javascript frameworks. Until .net 7 you could use every JsRuntime.JsInvoke... something like that to invoke JS function. In .net 8 they changed something and you cannot use it like that anymore or you get strange subtle errors when you get "too" dynamic. I'm figuring it out right now. But other than that you have a gigantic .net stack with build-in support ORM, RateLimiter, Caching, Distributed-Caching, MVC, WebAPI, ... The list of features is infinite.