The top photo shows some nice detail of the mountains that are not evident in the second photo, but the second image has a more effective composition. I would suggest cropping out most of the sky in #1. Note it is just a large area of a nice blue, but nothing very interesting to look at, no shapely clouds for example. So cut it out and we will look longer at the mountain which is the main subject.
#2 The palms frame the mountain and we can see their shapes nicely. The fence gives us something to look at in the foreground and it gives the image some depth. We can see that the mountains are far away.

#3 Wonderful flowers. Crop out the dark bars on the right. No need for us to look at them and draw our attention away from the flowers. The dark background helps to bring out the detail in the cactus.

You were not too far off: 'Subsume' also means comprise, contain, consist of; however, 'subtend' is the geometrically correct terminology. It was refreshing to see your revision. I was ready to jump on it.

As an engineer, I find it disturbing to read technical discussions in this forum containing incorrect spelling or terminology. It makes one question the validity and accuracy of the rest of the subject.

From the 35mm equivalent numbers, at 50mm- that is roughly what the human eye sees. Zooming into 500mm would give to 10 times magnification from what your eyes see.

'Is this a good lens?' That is a difficult question to answer. Does it give you satisfactory results? The Fuji camera is a fairly decent camera in its class. The zoom range is adequate for most uses. In my opinion, the lens is a good match for the camera's sensor and will yield pretty good photos.

I will be happy to try to answer any specific questions about the camera.