Only if you want to record lower bit rate high-res video. Canon's 8K raw is ~2600MB/s firehose and only CFe Type B can handle that. Canon's lowest 8K bit rate after the latest firmware is 8K UHD IPB light @ 340MB/s.
Sony's 8K recording speed is ~400MB/s
Can you tell the difference? That is the real question and if not then Canon has over specified their bus/card system and created the overheating issues that were pounced on by detractors.
The bitrate discussions fascinate me.
I used to be able to tell who came from film and who came from video.
The video folks would complain about the cost of media because they were used to paying next to nothing and favored lower bit rates.
The film people could not believe how cheap the media was compared to film so they favored higher bit rates.
Now we have people who never used either and are kind of in the middle.
Canon really threw the kitchen sink at the R5 and it goes from IBP Light to full Canon RAW.
It does not surprise me when people buy inexpensive cameras and focus on the cost of media but I wanted to slap everyone who bought $80K US RED cameras and complained about the cost of RED mags.
I only didn't because I suspect they would not cheap out on lawyers.