Is Switching to Multivariable Transmitters a Good Idea?

For our custom process skids we have to provide precise measurement of pressure, temperature and flow. To this point we've not used multivariable transmitters, mostly because of our parts-stocking responsibility for our installed customer base. Are there any practical reasons why we shouldn't switch? Cost, wiring and time all seem to favor a multivariable approach for new builds. The vendors we talked to suggest we're dumb not to switch.

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