I cruise ST a good bit. I still don't get why the tri folk insist on doing group rides on tri bikes. A used road bike is not that expensive, and if it isn't your go to doesn't need to be nice. Just get one.
I ride my TT bike a lot these days. If it isn't in town with all annoying stops, and am riding alone........I use it. But these folks doing draft packs of tri bikes is a disaster waiting to happen. Especially given owners of bikes with Di2 on both the extensions and brakes is probably less than 1 in 4.