Timing systems are pretty expensive and even the biggest timing providers have had problems this year, BDS, NDH, SDS and EWS.
I help out doing timing at events (mainly single run DH events) and it’s bloody difficult sometimes to get it all set up and ready. infact we had a recent timing failure where the interface to the computers failed and we had to use a manual system that had to time people to .01 of a second.
multi lap events or multi stage events really need to use some kind of RFID tag, either a dabber (which can be a pain) or some kind of RFID tag that is picked up as you go through a gates (expensive).