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EVs have purpose (specialisation depth, and reward for using the same mon long term) and aren't that obtuse at this point. You buy a certain item and you can max them. You use a certain item and you can clear them. Any way to simplify the concept would inherently have to go into rebalancing territory that reworks the numbers (eg instead of the current values, making them simpler and more rounded numbers and then visualising them but this would be impossible without actually changing how they impact the end stats).
IVs only serve to offer in-game variation with freshly caught Pokemon though, at this point. Which I DO think is valuable to have, it is very important to make sure Pokemon don't just feel like clones IMO. But in terms of how players actually interact with the system directly, it is a bit pointless as it is simply using an item to max all of them besides some niche cases.