You will never have any issues with running regular unleaded. Ever. Now fluid changes? You may notice a long term issue if you skip those.If you are not keeping it past 150k-200k then you may never have any issues. Might as well not change transmission fluid , AHC fluid, or diff fluid while at it to help save money.
But please continue doing what you want. Matters not a bit either way. Much of what you hear required for Lexus engines is nothing but marketing and product differentiation. And it seems to be working, reading many of these comments.