Telescopic is convenience-first. Multiple sliding sections collapse into the butt for transport, locking in place when you extend the rod for use. It's the most compact way to pack down a rod, and that's the entire point.
The trade-off is that the action across the multiple joints is never as clean as any of the fixed-joint styles — spigot, put-in, or put-over. Each sliding interface introduces a small stiff spot, and stacking three or four of those together changes how the blank loads. A telescopic is generally slightly heavier for its length than an equivalent two-piece, the action feels a touch dampened, and the upper sections wear over time as they slide in and out. None of these are deal-breakers for the right use case, but they're real.
Where telescopics earn their keep is travel. Hiking to remote marks, flying with carry-on only, fishing as a secondary part of a wider trip — these are the situations where the closed length matters more than the action. A telescopic that packs down to under 50cm fits into spaces that even a four-piece travel rod won't. For some kinds of fishing — light spinning on holiday, kayak fishing where you need a backup rod that lives in the hull — that's a worthwhile compromise.
What I'd be careful about is using a telescopic as a primary rod for serious shore fishing. The action loss matters more when you're fishing five hours straight, working subtle presentations, or pushing distance. For that work a fixed-joint rod will reward you more.
If you're trying to work out whether a telescopic suits a specific trip or use case, drop us a line and we'll talk it through.