There are now very good portafilters that almost completely take over the preparation. Such combination devices grind, tamp, and foam the perfect milk. You basically only have to switch once. Cleaning is much less work than with the KVA. The only disadvantage is the investment of about 1500 euros, and you need good beans, at least 20 to 30 euros per kg. My beans come from Florence; I have never found better.
If simplicity is paramount and it does not bring you joy, you might better look for a simpler solution. I have heard/read the passage about beans costing 20-30€ and more several times now, and I simply contradict the statement that you "need" these. You can have them like the wine for €20, the olive oil for €30, or the mineral water for €5 per bottle. Not only through Stiftung Warentest, Ökotest, etc., it is known that price does not always guarantee better quality; often it is even the opposite; supermarket products regularly become test winners and expensive brands fail miserably. I understand that people do it that way for themselves, but I have drunk enough coffee/espresso and especially cappuccino to know that the coffee bean represents only ONE part of the coffee enjoyment, just like the cheap machine compared to the luxury machine. The likelihood of quality increases with the price, but with the rising price, the likelihood also increases that I merely pay the high margin without quality improvement. Therefore, I would always recommend trying both cheap and expensive products and best deciding for yourself without knowing the brand/price. CEOs of various companies (mineral water, wine, coffee, etc.) have already been proven wrong when they chose the "cheap product" as number 1 and their own further down. It is probably like with the French country wine, which tastes best on vacation locally.