I've used loops sparingly in Band-in-a-Box for Windows but have used them enough to realize some things, mainly loops need to be simple, short and don't use too many in one song project.

By simple I mean a simple beat or one or two notes.
Short as in one bar works better than two bars and four bars don't work at all.
One loop has a far greater chance of working in a song than two or more.

There is an interesting video where PG Music demonstrates adding a bass loop to a song project. The bass loop consists of one note played multiple times (can't remember if it is four quarter notes or eight eighth notes in one bar. They enabled both tempo and pitch shifting. The audio produced from the loop followed the song's chord progression perfectly. In my opinion I don't think the result would have sounded as good if the loop was complicated as in a bass riff perhaps.

Jim Fogle - 2024 BiaB (1111) RB (5) Ultra+ PAK
DAWs: Cakewalk by BandLab (CbB) - Standalone: Zoom MRS-8
Laptop: i3 Win 10, 8GB ram 500GB HDD
Desktop: i7 Win 11, 12GB ram 256GB SSD, 4 TB HDD
Music at: https://fogle622.wix.com/fogle622-audio-home