Wow - thats all I can say at this point.
I was so looking forward to this camera, and everything in the video was going great - until, of course, he started saying "the still imaging features and operation of the EOS R5C are nearly identical".. I was waiting for the other shoe to drop after that. I had long predicted that IBIS would likely not make it in this camera, due to Canon's past practices of subtracting features in order to differentiate their product line. And of course, its missing. And Ill say it now - without IBIS, this camera is junk.
For me, this is really depressing. I'm still using my 5D Mark III from 10 years ago - not because I can't afford to buy another camera - but because I haven't found a camera that Canon has yet made that checks off all the boxes I need. All I've been waiting for since the beginning is a proper hybrid - a photo-video shooting product. Without IBIS, this product simply can't compete in the photography realm.
And when Canon inconsistently applies IBIS to their products, it also creates overall inconsistency with product expectations. For instance, Sony has IBIS in all of their pro models, including their video-oriented a7S III (!). This means that when you stick on a lens between an a7S, an a7R, an a7, an a9 or an a1, you know how the lens and body will give you a stabilized image, since all of these models have in-body stabilization. With Canon, there's no such consistency - you still have the EOS R and RP models without in-body stabilization, the R5/R6/R3 with stabilization, and now the R5C without - its really inconsistent, and it makes this complicated for the end user. For instance, should I buy the 24-70 f2.8 lens with in-lens stabilization, or the 28-70 f2 without? On a R3/R5/R6, this doesn't matter since the in-body stabilization is great and both lenses will perform great. But now on a R5C, suddenly that in-lens stabilization is a requirement.