Agree with all of that, except that for some companies logos are used as a substitute for internal expertise.
Most people who know what they're about will also know that companies sometimes pay to have other companies use their product, just for the logo on the presentation. Or that it could just be used in one little local office of a multinational. Or that it's just shelfware, bundled with whatever it is they bought that they actually wanted.
Everyone else thinks, "Oh wow, X are using it? Must be good!" And it grabs those people as customers. And that's why it's done.
Most people who know what they're about will also know that companies sometimes pay to have other companies use their product, just for the logo on the presentation. Or that it could just be used in one little local office of a multinational. Or that it's just shelfware, bundled with whatever it is they bought that they actually wanted.
Everyone else thinks, "Oh wow, X are using it? Must be good!" And it grabs those people as customers. And that's why it's done.