A piano has an orchestral sound imprint and thus is really mostly a solo instrument. With a digital keyboard, the main question you will be facing is what role you play in the context of your band.
The principal advantage and disadvantage is that you are the "joker" who can produce any kind of sound. For cover bands imitating a number of originals, this flexibility may come in handy.
However, if you are basically a substitute for orchestral rent instruments, you are not a definitive part of your band's sound.
Unless your band is focused around you, that can become problematic. If you are not playing as a joker, you'll actually be using very few sounds from your keyboard. Once you figure out which of those really make it in your band, you might consider replacing your keyboard mainly with one that does only one thing, but does it really well. It may even be something like an "electric piano" (Fender Rhodes style or similar) with actual mechanical action rather than sensitivity curves and stuff. An accordion is also a limited sound box but probably makes less sense for a good piano player since it is neither percussive nor offers the per-note dynamics that are the hallmark of piano play.
You'll find that a lot of famous band keyboarders are known for a particular sound rather than being flexible orchestral replacements. The guys who are virtuosi with all the abilities of electronic keyboards, in contrast, tend to be studio musicians rather than band musicians. They have a professional rather than a public image. One of the most well-known generic off-line music producer is Frank Farian who employed a number of stage actors (Boney M, Milli Vanilli) to sell his music.
But that's not what you want to be doing in a band. You want to find your place in the band rather than filling in whatever may fit into some particular sound arrangement.
The ubiquity of digital keyboards and expanders makes it harder for keyboarders to find their proper space than it once may have been.