I would have to imagine those with extensive reef systems still don't risk the contamination and go with ro
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I was speaking strictly for FW use. I believe that serious SW (especially reef) enthusiasts use Ro or RO/DI water* with marine salt....that already has the minerals.

* or they just might leave the condo, go down to the beach and come back with a couple of buckets of water. ;-)

 

Kinda like using prime for dexhlorination it's not a if deal but some will take the precaution
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Using Untreated regular tap water will lead to major algae issues in a saltwater / reef tank. You would be much better spending money and getting a good system something with 5 stages of purification.
Adding a water conditioner is not 100% necessary but would be seen as beneficial by many, there are some who dont use but while we cant force you to use it, you would potentially have less issues.

There are very sophisticated tests for all sorts of things in saltwater, although unless you have a full blown reef system which will take over a year to achieve these are not always necessary.

RO/DI water coming from a good quality system with an attached TDS (Total Disolved Solids counter), will produce very pure water. TDS is what you want to want to have very little of in saltwater.