You can do a lot of illustrations in PowerPoint, and they will get the message across. Sometimes, you need subtle nuances on the picture, too.
At this point, you either find someone who can design things for you, or do it yourself.
In my case, I need very specific models, illustrations, and diagrams. Explaining someone what I need will take so much time that it’s just ineffective. This is why I’ve been learning Adobe Illustrator for a while. Step by step, I can now build draw models in a matter of minutes.
And then, I realised something. Now I have one more skill in my bag. You can get a skill ike that, too.