It very much depends on the nature of the services and the abstractions.
I'm currently working on a system that has several multi-vendor abstractions - for file storage across AWS, GCP, NFS and various other things; for message queues across Kafka, GCP Pubsub, and direct database storage; for basic database storage (more key-value style than anything else) across a range of systems; for deployment on VMs, in containers, and bare metal; and various other things.
All of these things are necessary because it's a complex system that needs to be deployable in different clouds as well as on-prem for big enterprise customers with an on-prem requirement.
None of the code involved is particularly complex, and it's involved almost zero maintenance over time.
That would less be the case if you were trying to roll your own, say, JDBC or DB-agnostic ORM equivalent, but there are generally off the shelf solutions for that kind of thing.
I would never argue against doing it your case, but implementing an abstraction because multi-vendor support is an actual requirement is quite different from implementing an abstraction on top of a single vendor because you are trying to avoid "vendor lock-in".
I'm currently working on a system that has several multi-vendor abstractions - for file storage across AWS, GCP, NFS and various other things; for message queues across Kafka, GCP Pubsub, and direct database storage; for basic database storage (more key-value style than anything else) across a range of systems; for deployment on VMs, in containers, and bare metal; and various other things.
All of these things are necessary because it's a complex system that needs to be deployable in different clouds as well as on-prem for big enterprise customers with an on-prem requirement.
None of the code involved is particularly complex, and it's involved almost zero maintenance over time.
That would less be the case if you were trying to roll your own, say, JDBC or DB-agnostic ORM equivalent, but there are generally off the shelf solutions for that kind of thing.