A few reasons:
Easels enable the artist to sketch and paint on a variety of small and large surfaces at various angles. Typical surface are boards, paper, canvas, glass and metal sheets.
Easels come in different shapes, sizes, and functionality of purpose, from A-Frames to Rectangular Frames. Some are designed for studio use, others for field use. Some are made for transportability, others for restoration work. There are desktop models and floor models. So choice can be somewhat overwhelming.
An easel can be tilted at an angle, making it easier to draw without smudging your drawings. You can sit, stand and view a person, landscape, wild life, still life and sketch in real time.
Working at an angle allows waterpaint to flow and create beautiful effects for background painting and landscape painting.
Acrylics and Oil Painting
One can sit, stand and view a person, landscape, wild life, still life and paint in real time.
So, have your say, share your experiences and uses with easels for aspiring artists to learn from, by commenting below.