This is absolutely great, because it allows cross platform usage, often without the developers doing anything at all.
For example, it meant that I was able to join a Microsoft Teams meeting from my phone, without installing any apps (I prefer to rely on my browser's sandbox to protect me from abusive behavior apps like to engage in). They do refuse to work in Firefox and you need to switch Chrome to desktop mode, but it works. Not perfectly, but well enough.
It also means that teams with limited resources can reuse a lot of code across platforms, making cross-platform development much more likely to happen.
For example, it meant that I was able to join a Microsoft Teams meeting from my phone, without installing any apps (I prefer to rely on my browser's sandbox to protect me from abusive behavior apps like to engage in). They do refuse to work in Firefox and you need to switch Chrome to desktop mode, but it works. Not perfectly, but well enough.
It also means that teams with limited resources can reuse a lot of code across platforms, making cross-platform development much more likely to happen.