Further to to your post, and this time specifically aimed at your intended use: "to capture stills of flying and perching birds as well as wide angle landscape compositions".
Since the R7 is an APS-C 'crop' sensor camera, it does not display the same field of view as the full-frame sensor bodies. I enclose a link to an article I wrote on the implications of sensor size:
Focal Length, Field of View, Shutter Speed, Sensor Size &Equivalence
The upshot of this that sensor size has both benefits and drawbacks. At the wide angle end, for landscapes or shots in restricted spaces, the resultant Field of View (FoV) will be restricted and you will not get the full benefit of the optics of a wide-angle lens. However, on the telephoto end the FoV is restricted, creating an 'image boost' effect like using a longer focal length lens. So there is not one perfect solution that fits all cases.
Logic suggests that one would go with the configuration that works for the most cases. However, there is one more factor to consider that may be of assistance. That is the MP resolution you need for what you produce. Makers tout large MP sensor capacities, but if one is producing for social media, websites or digital display (which are becoming the dominant media) then a large MP sensor is not necessary as the images will be downsized in any case. For example, the image size limit for this site is 5MP, which requires some serious downsizing of image before publication.
I had the benefit of being able to have both FF and crop sensor cameras through my career and still do, but I decided to make a choice when I went to the R-series Mirrorless Interchangeable Lens Camera (MILC) system. I went full frame. I did so when deciding on the Canon EOS R6, even though it is only a 20MP FF sensor. To me, the benefits are that it has a definitely superior dynamic range over the 45MP R5 and a significant improvement over the R7. For example, tests and my own experience indicate that while the R7 exhibits noise above 3200 ISO, the R6 can be essentially noise free up to 10,500 ISO! That means I can shoot in quite low light and get higher shutter speeds by raising the ISO. The R6 has the ability to shoot in crop modes of 1.3 and 1.6 crop if one wants to compose in cropped mode. The resultant MP capacity for 1.6 crop mode (the same as the R7 sensor) is about 8MP, but that is still absolutely fine for digital display and images up to 11"x14" prints. I used to shoot much larger prints and even billboards using the 6.6MP Canon D60 from 2002!
There is now the R6MkII, which has a new sensor of 24MP, giving a crop sensor value of about 10MP, and that has pushed the cost of the R6 down quite a bit. So, I would suggest investigating the suitability of the R6 for your needs. In fact, one can even buy the 45MP R5 refurbished by Canon for just under $3,000. This is a seriously high performing camera - FF, weather sealed lots of extra features. Refurb units come with a guarantee:
Shop Canon Refurbished EOS R5 Body | Canon U.S.A., Inc. While more expensive, you will get many years of service out of such a unit.
cheers, TREVOR
The mark of good photographer is less what they hold in their hand, it's more what they hold in their head;
"All the variety, all the charm, all the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris
