I continued to make about 30 maps in old editor when mta 1.0 was existing already 2 years. I even converted sent to me mta1.0 maps to mta1.1.2(old) for editing the bugs. But there was one good reason - first versions of new editor were very bugged. Nowadays new Editor is much better and more convinient than old one. I worked in old editor ~ 2-3 years, and I can compare, map creating in new one is really faster and easy, especially nice is F3-button and fast-slow moving.