I have Avast Primium, but when it comes to performance issues it takes me to a page to pay for another subscription. I do not understand that since I have already paid for premium.
Smart Scan advanced issues etc may upsell or promote additional Avast products extra to the Avast Premium AV product. If Avast Premium gives you the protection you consider adequate, then it is up to you if you want to subscribe to other products advertised. You should not be scared into subscribing to extra products you do not want or do not need.