OpenTofu is doing really well I'd say, and only picking up steam as it's going.
Product roadmap-wise, the team has made some big improvements that have been requested by the community for years, with another big release coming very soon (I believe next week or the one after), here's some of the major ones:
- End-to-End State Encryption - lets you encrypt your state-file end-to-end, either with a key management system like AWS KMS, or static keys.
- Early Evaluation - the ability to parameterize initialiation-time values, like module versions and sources, backend configuration parameters, etc. and keep them DRY.
- (Coming in 1.9) - provider iteration, which lets you use for_each with providers, e.g. create one provider per region, something that currently requires a bunch of copy-paste, or tools like Terragrunt
- (Coming in 1.9) - -exclude flag, which is the opposite of the -target flag, letting you skip planning/applying certain resources.
Probably the best way to see a summary is check out the release blog posts for 1.7[0], 1.8[1], and 1.9-beta[2]. Many of those required non-trivial changes to existing parts of the codebase.
One of the biggest Terraform contributors has also joined Spacelift a couple months ago to work on OpenTofu. All things considered, I'm very confident that the team will be able to handle any feature it sets their minds to, and that those improvements will keep coming. There's a ranking of top-voted issues which is probably the best way to loosely see what will be tackled next[3].
[0]: https://opentofu.org/blog/opentofu-1-7-0/
[1]: https://opentofu.org/blog/opentofu-1-8-0/
[2]: https://opentofu.org/blog/opentofu-1-9-0-beta1/
[3]: https://github.com/opentofu/opentofu/issues/1496
Disclaimer: I am involved in the OpenTofu project and was previously its tech lead.