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Out of interest, what are the problems you’ve encountered?
Manufacturing QC issues mostly.
Hydro lines crushed during assembly, over-torqued drive unit mounting bolts, laughably crooked post mounts, FHB dust caps backing out until the cassette seizes, speedometer cables that are too short and tear at the the connector as a result, frames designed around boost 20x2.4" tires where the derailleur/chain STILL rubs the sidewall of the tire in the largest cog, etc etc.
Out of interest, what are the problems you’ve encountered?