The word "smart" is confusing for beginners. Everyone thinks that "smart" is cool and powerful. I also launched it once.
In fact, boot scanning is cool and powerful. And smart scan gives only recommendations for improving security. You need to understand what it is, why and what will come of it. These measures will make someone better, and someone worse. Some may be erroneous. There was already such a question in the Russian topic. The person had DEP enabled by default, but smartscan issued a similar warning.
For example. Here I have avast counted 37 old drivers. And claims that this leads to performance problems. But I have old hardware and, accordingly, an old operating system. If I install new software, I will really have performance problems. In addition, my old drivers have been working stably for many years. Where is the guarantee that there are no new bugs and vulnerabilities in the new drivers? And where is the guarantee that new drivers improve performance? In life, the new is not always better than the old. Everything has its pros and cons. As an experienced engineer, I understand this well. But marketers say that the new is always better, even if it is worse.
To buy new hardware and software just for avast to tell me that I'm perfect man, I think it's stupid.