Much more reliable than beats and vendor specific forwarders (chronicle forwarder and fdr) in our experience. Vrl is also pretty useful at "preparsing" massive logs e.g. aws cloudtrail and imperva abp
Timber definitely intended to just rock out & demolish everything else out there with their agent/forwarder/aggregator tech. But it wasn't a competitive play against OTel, in my humble opinion. Timber's whole shtick is that it integrates with everything, with really flexible/good glue logic in-between. A competent multi-system (logging, metrics, eventually traces) fluentd++. OTel - I want to believe - would have been part of that original vision.