The brothers, especially very early on, added a lot of charm to the live shows. If you were going to see the Jackson 5, you were there for them, not just Michael, every brother had this unique role to them & played well with each other, interactions in between songs, their movements, all worked together to make an amazing live show that didn't require much, A good example would be "It's Your Thing" & "Thank You (Falettinme Be Mice Elf Agin)" from their 1970 National Tour. .
The Jackson 5's band was basic, but they worked together perfectly to capture so much energy and emotion. This is perfectly encapsulated in the 1972 performances of "Ben" & "Ain't No Sunshine". Songs that were string heavy or required multiple takes of vocals & guitars, were stripped back to almost their most basic, making a beautiful sound that rivals/beats the album versions. To quote the official Forum site, "one of those jaw-dropping performances (Ain't No Sunshine), with young MJ stretching his soul over a risky, long arrangement, a moment that reached beyond satisfying the screaming fans who’d come to hear the hits" & "The first half (Ben) has no background vocals – and this being a J5 show from early in the decade, no strings, horns or video screens, either. Just MJ backed by the sparest arrangement...". They used what they had to the fullest, a guitar, a bass, drums, an organ, & made magic.