Not having an opt-out toggle should definitely be a cause of concern. Not everyone is running Debian just for the FOSS-only firmware, but there’s definitely a sizeable number of people doing so. Letting the user choose whether they want to install proprietary firmware or not is absolutely an important choice.

This is assuming there really isn’t an opt-out somewhere in the install menu.

Edit: it may be that I am running something without FOSS drivers for it. I happened to forget about it. So what? I’d rather it not run (unless it’s critical), and I definitely want to be prompted that a proprietary driver is recommended to run the specific device because no FOSS driver is available. Not doing so is taking away my choice in the matter, and if Debian is really doing that, then I will personally have to rethink my options, including my donations