You only need CFe cards for video in 2 modes on the R5: 8k30 raw (2600Mbps) and 4k120 (1880Mbps). The other video options can use fast SD cards.The 4 year old FX3 supports dual slot CFexpress cards doesn't it? Dual SD cards doesn't compete at all when recording in high bitrates to a CFexpress card.
The A1 didn't need CFe A cards for any mode as it uses codecs for 8k (raw not available). Similar for 8K light on the R5.
That said, CFe B cards are now cheaper than fast SD cards and more durable and better at dissipating heat. Fast SD cards are generally a special order ie the backward compatibility if you need a card doesn't apply.
For stills, CFe cards are useful for clearing the buffer faster than SD cards but are still not mandatory.
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