definitely things that need to be considered - vendor lock in being the worst, IME. i'm less worried about API call integration, as i tend to isolate 3rd party APIs from my code... but that doesn't prevent all vendor lock-in.

for me, being able to focus on features is more important than these concerns, right now. i expect that over time i will take some of these tasks in and write the code myself, but at the moment i'm more concerned with feature growth.