Ok, I have a kind of answer. I was able to borrow a Canon SX70, and even though it has twice as much zoom as my Olympus with 75-300 lens (150-600 equivalent), the pictures are worse. The pixels are fuzzy, by more than a factor of two; the autofocus is much slower and less precise, and the zoom is slower too. As my Oly with 75-300 is of manageable weight, I will stick with that.
And btw, no, my pictures above are crap. I chose them explicitly to show off subpar pics, that are however very useful for bird id.
The fact is, sometimes, rare times, I aim at great photos. Most often, my joy is in identifying the birds and observing them, and I throw away (delete) the pictures once the identification is done. I used to be obsessive about photography, I developed my own film, etc etc. I still am obsessive for some photos I care. But I learned that simplicity in life has value. When I walk around to birdwatch, my goal is the birds, and everything else is best kept simple.
And btw, no, my pictures above are crap. I chose them explicitly to show off subpar pics, that are however very useful for bird id.
The fact is, sometimes, rare times, I aim at great photos. Most often, my joy is in identifying the birds and observing them, and I throw away (delete) the pictures once the identification is done. I used to be obsessive about photography, I developed my own film, etc etc. I still am obsessive for some photos I care. But I learned that simplicity in life has value. When I walk around to birdwatch, my goal is the birds, and everything else is best kept simple.