1. R5 is mirrorless and therefore lighter. Wait for the R7 to make a fair comparison.Canon R5 + RF 16mm + RF 24-105mm f/7.1 + RF 100-400mm = 2328g. This covers your FF-equivalent 16-400mm, and because the R5 has a pixel density only slightly less than the 7DII, it has much more reach than 250mm on the 7DII.
2. Keep the cost factor in mind... I'm too lazy to look for the cost of R5 with all these lenses... But I think it's far beyond any fair comparison.
3. There is quite a heavy gap between 16 and 24 mm.
4. I sometimes take the combination of 7DII with ef-s 10-18mm, ef-s 16-300mm and ef 160-600mm(C). I don't know (and don't care about) the exact weight, but there is no gap between focal lengths. It gives you a (seamless!) FF-equivalence of 16-960mm(!). Additionally it is much cheaper ...
I know the quality will not keep up with R5. But when it comes down to zoom range, reach, portability and price ff is not the "best" option.
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