Bundle size matters until it doesn't. Flutter is absolutely not suitable for web pages, but for web applications the situation is different. I was quite hesitant about Flutter web, up until around 3 years ago, the binary size being biggest concern. That was until I looked at Linear (which we used back then) and found out that the download is several times larger than whatever we were building with Flutter web, and nobody cared. I used to obsess about every kilobyte transferred, but I think at least when it comes to applications, that time might be over.