The reason this matters is that browser-based measurement has been degrading for years. Ad blockers, Safari's intelligent tracking prevention, shortened cookie lifetimes and now Chrome's changes all remove conversions from your reporting. Those conversions still happened. The platform just does not know, so its optimisation algorithm is learning from an incomplete picture.
Here is the honest constraint. Server-side tracking adds infrastructure, cost and a genuine maintenance burden. For a business spending Rs 40,000 a month on ads, the recovered signal rarely justifies that. For one spending several lakh with meaningful measurement loss, it frequently pays for itself in improved algorithmic performance alone. We assess before recommending, and we say no reasonably often.