I joined few days ago and have recently asked many questions. In most of these questions, I use image to make everyone understand it better. I prefer to use both MathJax as well as Image. But most of the time, people ask me not to use image. I have used image in the most recent question for better explanation and i have got 1 downvote. I really don't understand what is the problem if a questioner use image instead of using MathJax everytime. Typing MathJax takes so much time for me, Please try to understand that using image makes it easy for me. What is the problem with image in community? I really don't understand this.
This is largely an accessibility issue.
Images are not searchable. Whatever you think of the quality of the built-in search engine, or external tools such as approach0, and their ability to find good matches for search terms, they do exponentially worse when the only information is given in image form. Relying on images to convey vital information makes it much, much harder for other users to find that information.
Images are not describable. There are users with visual impairments who access this site using screen readers. Screen readers typically cannot do very much at all with images (and rely on whatever information is contained in the image
altfield to convey information to a user. Posting vital content in images without an appropriate
altfield renders those images completely inaccessible, and taking the time to correctly describe the image in an
altfield is equivalent to writing up the mathematics in MathJax in the first place.
Images don't scale well. Images on this site are raster images (that is, an image here consists of an array of pixels, with each pixel assigned a color). Raster images don't scale well—if one has a visual impairment and views the site using large fonts, images are either left unscaled, or become a pixelated mess when scaled up.
Images are large. This may seem like a minor thing in 2021, but there are still a significant number of users who access this site using relatively slow internet connections, or metered connections. Using images to convey vital information creates a bottleneck for those users.
In short, vital mathematical information should not be restricted to images, as this makes the site harder for a number of people to access. It is sometimes necessary to include an image (e.g. a figure in a geometry problem, or a commutative diagram), but it is best to use text and MathJax whenever possible.