What's the advantage of a 'combi' or attachment-capable trimmer?

Attachment-capable shafts (like Husqvarna's LK series) let a single powerhead drive a string trimmer, edger, pole saw, hedge trimmer, brush cutter, and more. Verified-purchase reviewers and lawn-care community threads consistently flag this as the best long-term value if you'd otherwise buy multiple single-purpose tools, with the trade-off being a slightly higher entry price and some play at the shaft coupling over time.