I think you've just been unlucky. I was born and raised in the UK and have never seen such 'pump' systems, except where the toilet is in a basement and a pump is required to move the water up to the sewage line.

The in-wall cisterns may look like a maintenance nightmare, but on Grohe products (I assume other manufacturers are the same but don't have experience) you can open the flush plate and easily take out every single part through the 20x30cm hole. It's actually easier to repair than a traditional toilet as you don't require any tools, other than a flat screwdriver to turn off the water valve.

I could rant all day about poor habits of the construction industry in the UK, but toilets aren't even in my top 10.