Will that not lead to bloat and/or more deprecation of services in the future?

I suppose you can tell people "hey this service shouldn't be relied on! We might get rid of it one day!". But that erodes trust - people just don't fully internalise what that means, they expect the same level of long term support from all AWS services. Soon the common sentiment will turn into "AWS changes its services all the time" when the truth is "AWS changes the services marked as experimental all the time".