Most people who spontaneously write connected characters want to write faster, while a few imitate them after seeing connected characters that they think look good.
Primary school teachers do not approve of unkempt handwriting because they can see from the connected characters that students have improper learning attitudes. In fact, once you have mastered the skills of neat calligraphy (it is necessary for the whole elementary school, and it is best to persist until the third grade of junior high school), it will be easy to learn beautiful connected characters such as running script and cursive script in the future; if you can spontaneously write early, if you have no problem with neat calligraphy. Before I get home, I can't even write cursive calligraphy well, which takes several times the effort. One day, I have to start practicing neat calligraphy all over again!