I agree that charts are more “guides”. Or quick refreshers. I often write the chord (or just note) changes for a verse and chorus and bridge, but then just write “same” for verse 2 or such. And sometimes it’s not the same and that’s where charts are useful.Many great comments. If your band is cool with charts, then use them. The more you play the songs, the less reading you'll have to do.
My 2¢: I juggle a half-dozen regular bands and do sub gigs on top of that. One band is all original, another is female-fronted covers. Even with the remaining male-fronted cover bands, there's only partial overlap between sets. So, for the better part of a decade I've been using a tablet for almost every gig I play. It's an Android tablet with the Setlist Helper app. The app now contains nearly 700 songs split among 20 different band setlists. Some of those bands have no doubt broken up, but I've used a dozen of my band setlists within the past couple/few years.
Context: mainly bar gigs. I always ask a new BL whether charts are OK, and the answer has always been "sure. whatever works". I have occasionally used actual chord charts in iReal Pro, but 98% of the time I'm using my handwritten charts in Setlist Helper. I use SLH as a glorified text editor, cobbling out the song structure in my simplified version of the Nashville Number system*. Nearly all the time, the chart will fit on one screen.
IMPORTANT: I'm not reading every song! For any band I perform with regularly, I only read a couple/few songs per set, mainly recent additions. Also, unless the song is brand new to me or one I haven't played in a long time, I only need a quick glance or two at the chart to remind me of the structure. I'm hardly ever nose-down in my tablet for a song, and I've developed the ability to quickly adjust on the fly if a band plays a song differently than I've charted it.
* OK, here's an example of my number shorthand. It's not perfect... e.g. it doesn't say how many repetitions of the verse pattern. But I don't need perfection, I have ears. It's a super simple song, but the only time I played was at a sub gig. So, I jotted it down for that one gig, and it remains in my tablet for future reference along with many, many others.
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Here are a couple of mine. I just used the Bob Marley one this past weekend having not played it since last summer:
Build me up Buttercup was one of those songs I had a mental block on. I hate it.. passionately. So I had to stick to the chart for far longer than I should have. But after 7 months of regular play I finally got it. Plus the “GOTO brown eyed girl” was important since we don’t stop between them.