Unduly pessimistic as a general statement. We and several other operators here give whatever attention is required for each individual diver. We (many of us) have small groups and are quite prepared, logistics permitting, to staff a dive on a one-to-one basis when there is such a need.
You did say almost everywhere. Throughout Belize there are stringent requirements for dive guides, both in terms of their diving abilities and qualifications and in terms of their guiding abilities. Every guide must pass a gruelling and extensive course to be certified as a guide, and that has to be renewed each year. And most dive guides that I know, certainly all of mine, are either certified divemasters or instructors. There must also be adequate insurance in place in case something does go wrong.
I'm not starry-eyed and I do know that these rules are sometimes breached, but I equally know that that is not common and the sanctions on both individual and employer are quite draconian. In my immediate area (San Pedro) I don't know of any operator that doesn't apply these rules strictly.
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