Particularly with the toilet paper ‘shortage’ it’s wild to me that so many people still waste their time and money using paper.
I certainly don't want an integrated seat that gets filthy with splash back when somebody takes a dump. I can understand the wands more, but still they risk getting very dirty from various users with various skill levels. We use wet wipes which is not ideal ecologically, but a bidet risks being far dirtier than a shopping cart handle and we conserve elsewhere.
What I think you mean is that the sprayer/nozzle can get dirty? Do you have similar fears of your kitchen/bathroom faucet? because there's no way anything can stay in the spray nozzle of a bidet. that part self cleans instantaneously.