As the swallows returning to Capistrano, so too the cries about base storage in iPads with every new iPad release.
The reason why Apple does this is because... it works. FOMO is a strong motivator to get people to bump up to the higher storage capacity. Even the mythical "future-proofing" causes people to part with more of their money.
Complaining will not get Apple to change. It's perfectly fine to vent, but the only thing Apple will respond to is... money.
For a long time people wanted a mini iPad. Steve Jobs said that it wasn't a good size. What caused him/Apple to change their minds? The alarming early growth of 7"-8" Android tablets. Apple didn't respond to customers pleas, but they DID respond to sales to competitors.
A phone or tablet would have to be amazing for me to buy one that doesn't have support for removable media. My current smartphone and full-size tablet both offer that support. It's terrific to have that.
My tablet has 6GB RAM, quad speakers, 128GB built-in storage and support for 1TB microSD cards. I bought a 256GB high speed microSD card for $25. Although future-proofing is a myth, should I run out of space with 256GB, I can spend another $50 for a 512GB card.