I would go the other way and say that a 4-32 is quite adequate. The important thing is optical quality, my experience, years ago, was it was quite possible to have a 4x40 with better clarity than a similarly priced 3-9x40. I currently have two rifles, each with zoom scopes, one a Tasco 2.5-10x42 (fixed focus) and a Simmonds 3.5-10x44 (also fixed focus) and use both of them at 5x for 90% of the time. The other 10% is when I drop the magnification to 2.5x or 3.5x for very close work. This latter isn't because the 5x won't work close up, but I like the wider field of view you get with lower mag.
I have found that cranking up to max magnification, for air rifle range shots, adds nothing to my accuracy, it takes time (and faffing around getting everything focussed), cuts down on my field of view, and in my case makes it harder to shoot with both eyes open.
If I think that fixed scopes are fine, why do I have two zoom models? Well, buying and using them has been part of my learning process, also, I bought both as "end of line" from Cabelas in the US, so got them for about 1/3 their price here
If I had to buy a scope in the UK, now, I would be looking at light gathering power and optical clarity WAY ahead of magnification or zoom.
Sorry to throw a spanner in things