Having lived and cycled in Amsterdam to me it did seem like a major investment. Sure if one were to design a greenfield city then it’s not a big deal. But to pivot a car centric city to safely accommodate cyclists is a major change. The city residents have to go through the transition process which isn’t going to be fun.
I’ve seen it done half ass way in India and US which end up being deadly for cyclists.
I am all for cycling, I absolutely loved my two year stint at Amsterdam. It’s a life changing experience. But let’s not underestimate the costs involved in transition. Also, the city residents have to be onboard with the process, as they are the biggest stakeholders. Otherwise the implementation will get dumped half way through with disastrous results.