Hi NancyatMSFT , thanks for asking about workarounds I might use. Actually, I've nothing to do if MS is going to present equal access to edit any tasks for all project members, even if it's not assigned to them!!!
I can see ajewson presented a clear explanation for what a project management community would expect from a professional collaborative project management tool.
For sure, there're positive comments about enabling all users to edit tasks with their current MS O365 license, and it looks like a so long waited for feature. I believe they're coming from "Planner" experience -a simple and straight forward app -where all have equal role to execute a plan. Definitely, it's not a professional project management experience where controlling schedule, and effort is a the most critical role of a project manager/ scrum master/ or a team leader.
In real life, professional project management business, just imagin a project manager creating an execution plan for a mega project and sharing it with 10 project members, each one of them is assigned to few specific tasks. Along the project execution course, he finds that the plan is changing with no prior approval from anyone. Tasks are added, updated or even deleted.
This might be aligned with the strategic plan merge of P4W & Planner, and we might not have the power to unroll such features but I'd like to highlight that if such merge is going to come up with a distorted app that is mixing things up and destroy P4W application potential as a professional tool that can be used by large organizations running multi-million dollars projects, it'll be a real frustration for those believed in MS ability to capitalize on its wide offering from Power Apps and the future of automating business operations.