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If 2 viable solutions have this kind of long term vs short term trade off, technical decision makers need to talk to business decision makers.

Often it's reasonable to incur some technical debt with the short term solution, and then switch to the long term solution later on.

Delaying work gets you to market faster, costs less, and means you understand the problem better for less effort.

Obviously, if it's not a feasible roadmap to go with option a first and migrate to option be later, it's the techie's job to make this abundantly clear to the pm / business.