Bug#1032071: ARM firmware packages included in amd64 installation images

Package: debian-cd
Version: 3.2.0
Severity: minor

debian-bookworm-DI-alpha2-amd64-netinst.iso includes firmware packages 
for ARM platforms:

  firmware-qcom-soc
  firmware-samsung
  firmware-ti-connectivity
  raspi-firmware

These packages add 34 MB to the ISO image, which is not negligible.

Additionally, IIUC the installer only needs firmware for storage, 
network/wireless and sound devices. It uses generic graphic drivers for 
display so it does not need GPU firmware. The netinst image includes 
firmware packages which do not seem to be needed by the installer:

  bluez-firmware (Bluetooth)
  dahdi-firmware-nonfree (VoIP)
  firmware-amd-graphics (GPU)
  firmware-ast (GPU)
  firmware-ivtv (MPEG codec)
  firmware-realtek-rtl8723cs-bt (Bluetooth)
  firmware-siano (TV receiver)
  hdmi2usb-fx2-firmware (?)

Among them, firmware-amd-graphics takes 12 MB.
Is it useful to include these packages in the netinst image ?
Couldn't they be downloaded from a mirror like other ordinary packages 
when needed ?

Note: it also includes firmware-linux-nonfree which is a meta-package 
not containing any firmware file.