You need it once you run more than two or three tracking tools, and you can skip it if GA4 is the only thing installed. Tag Manager is a container that lets you add, edit, and remove tracking without touching site code, which matters most when agencies change or a platform releases a new pixel.
The real payoff is event tracking: form submissions, phone-number taps, chat opens, and quote-tool completions all become conversions you can send to GA4 and Google Ads from one place. Set it up once, name tags clearly, delete tags when a tool leaves, and keep the account under your own Google login.
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