I don't think the 2894 is particularly unloved on its own - the problem here is yes, the Caliber 17 in the Monaco is a modular chronograph using a Dubois-Depraz chrono module on top of the 2894... and that is something most independent watchmakers will straight up refuse to work on. TAG service centers won't have any issue with it though because just like Jim said, they just replace the chrono module rather than service it. (Though they aren't thrown away, just taken to a central location for refurbishment and eventually will become one of the replacements)
So yes, to answer your question these can be a bit more expensive to maintain since you're stuck using TAG's official service centers. Depending on how much your usual watchmaker charges for a chrono service, might not be all that much more though
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