I'm someone else who has inherited a bunch of ad-hoc orchestration systems and also used Temporal quite heavily. The latter does certainly come with some overhead (not so bad in the age of LLMs), but it also guides you along a well-trodden path of good practices. The latter being very important - it means that when you want to take on more advanced capabilities, you probably haven't painted yourself into a corner too badly and can take that on fairly easily. Think: retries, multi-tenancy, multi-lang, observability, etc.