Hence "As an historic note with little relevance to your point".

At best, treat it as comment about how hard it is to think what detractors to X might have said before X became wide-spread. I believe your example of 'lack of mechanics' is poorly chosen; akin to saying 'My biggest gripe with hearing about fully autonomous cars is that they will be so expensive that only the five richest kings of Europe would own them.'

As a real-world examples I think are better, 'My biggest gripe with hearing about telephony is there won't be enough operators to handle the number of calls.' 'My biggest gripe with hearing about computers is that they are too bulky.' 'My biggest gripe with television is I'm at work when my favorite show is on.'