This is the type of arrant pedantry up with which I will not put.
Those who sniff decay in every shift of sense or alteration of usage do the language no service. Too often for such people the notion of good English has less to do with expressing ideas clearly than with making words conform to some arbitrary pattern.
When a scientist considers all high-tech mental machinery needed to arrange words into ordinary sentences, prescriptive rules are, at best, inconsequential little decorations. The very fact that they have to be drilled shows that they are alien to the natural workings of the language system. One can choose to obsess over prescriptive rules, but they have no more to do with language than the criteria for judging cats at a cat show have to do with mammalian biology.
The American language should be descriptive rather than proscriptive.
This notion was very offensive to most English literati.
There is no reason why we shouldn't be able to split an infinitive, any more than we should forsake instant coffee and air travel because they weren't available to the Romans.
Language mavens commonly confuse their own peeves with a worsening of the language.
Prescriptive grammar has spread linguistic insecurity like a plague among English speakers for centuries, numbs us to the aesthetic richness of non-standard speech, and distracts us from attending to genuine issues of linguistic style in writing.
Forcing modern speakers of English to not - whoops, not to split an infinitive because it isn't done in Latin makes about as much sense as forcing modern residents of England to wear laurels and togas.
Language pedants hew to an oral tradition of shibboleths that have no basis in logic or style, that have been defied by great writers for centuries, and that have been disavowed by every thoughtful usage manual.