That doesn't mean that most inventions are beneficial. It's very much possible that only 5% are beneficial but their benefits outweigh the harm done by the other 95%.
Useful inventions don't need advertising to spread. They even did so during the middle ages. No one ran adverts to sell crop rotation. It spread because it's a good idea. It took a while but that's because compared to today, information and transportation networks basically didn't exist.
Advertising as we know it today isn't even helpful for spreading useful inventions. Yes, there are ads for them, but they are crowded out by useless ones. If the message we get from advertising is
> DRINK SUGARY WATER. KYS WITH CIGARETTES. YOU'RE WORTHLESS WITHOUT CARBON CRYSTALS. DRINK SUGARY WATER. KYS WITH CIGARETTES. YOU'RE WORTHLESS WITHOUT CARBON CRYSTALS. ELECTRIC LIGHT IS GREAT. DRINK SUGARY WATER. KYS WITH CIGARETTES. YOU'RE WORTHLESS WITHOUT CARBON CRYSTALS. DRINK SUGARY WATER. KYS WITH CIGARETTES. YOU'RE WORTHLESS WITHOUT CARBON CRYSTALS.
you could argue that speeding up the spread of electric light is worth the damage done by advertising. But what happens here is that garbage ads crowd out the actual useful information. It's hidden like a needle is haystack. Information overload and the associated stress reduces people's ability to find the useful information and to actually think about what they need and want.
The alternative is not to abolish communication. You don't need ads for people to learn about products that are useful to them. That's in their interests so they will seek out newspapers, magazines etc. that report about new products — aiming to serve and inform the customers that buy them rather than the producers that want to sell their products whether they someone needs them or not. The above wall of text would not be replaced by nothing but by "FYI: electric light exists. Its advantages are.... but keep in mind that...." — information rather than spam.
[1] Are we really happier than hunters and gatherers?