What about the branches that happened early on? We essentially have only two lineages of macroscopic organisms that are actually fundamentally different: Plants and animals.
I would expect any kind of macroscopic extraterrestrial life to be at least as distinct from Terran plant and animal life as they are from each other.
That's not true, we also have fungi as a macroscopic lineage.
Or maybe you put them in the plant group? If so, that's a mistake, as they are more closely related to animals than they are to plants.
And then consider the selective pressures from plants vs fungi. A fungi gets its environment. Plants do some, but also need to perform photosynthesis. These have very different selective pressures for these lifeforms.
So the idea we'll see some vastly different concepts with different starting blocks is possibly unfounded.
Alien life might be very different at low level depending on their environment, but in terms of macroshapes, things like the formation of a head with eyes and mouth, upper and lower limbs, bilateral symmetry and so on will repeat over and over.
We'll see (in another life probably).
That feels like a really bold claim given the evidence.
Unless we find a planet composed entirely of solid smooth rock we won't find wheeled animals.
Considering that we have a whole class of lifeforms that have nothing like a head with eyes and mouth or limbs, the idea that this would evolve independently more likely than something completely different, is also possibly unfounded.
Plenty of animals that have 2 eyes and no 3d vision, they try to get as close to 360 coverage as possible.