Let them think what they like, at least you've created something - RTR models bring new blood into the hobby - they just have to then realise the pleasure in making their own.
Even if you're modelling skills may be a bit belt and braces, there's nothing nicer than seeing everything work - electronics may be efficient, hi-tech and the future but it's not as much fun or as fascinating as wheels and pulleys, gears and levers whirring and clicking away - you can't see a circuit board working can you?
Besides, according to my fashion designer daughter, you're not 20 years behind times - you're 'retro', which is a far cooler title.