My two cents. It is important that the alternates are introduced. I am assuming the beginning level with this post, but I think they should be
introduced as soon as developed enough on regular fingerings. Personally, I think alternate fingerings are more important on slow, slurred passages. Probably, since this is how I first learned the chromatic scale,As some have said, I think most good players get used to flipping F# and C without much problem. I use regular F# and C when playing the chromatic scale fast. Side C is not always a great sound on some saxes. If slower, then I use alternate. As far as Bb, my choice is Bis for flat scales, other than Gb. However, when teaching private lessons to advanced players, I often make them learn both side and Bis. I fell that students should be proficient with both fingerings.