Personally, my friend is a carpenter and lives with his dad to save money. This is in Seattle so tons of construction and work to go around. He says he wishes he studied computer science in college (has an english degree).
Worse yet, when your body does fail or is injured, that wage tends to stop. Most tradespersons are working for very small companies, often incorporated as their own one-person company. If you cannot work, it all just stops.
One thing that makes the military different it that while the military can be very hard on your body (infantry) your wage does not stop if you are injured. A civilian carpenter with a broken leg must live on savings for a month. A military carpenter with a broken leg just won a month of desk duty without any drop in pay.
But, yeah, on the whole this business about the virtue of trades and Boomer Facebook making baseless claims about how much money there is to be made is ... problematic. I've been there and these folks face all sorts of risks in the near (e.g. falls, electrocution) and long (e.g. Mesothelioma, (increased risk of) Parkinson's, etc.) terms. Working conditions have improved and seemingly everyone wears hiviz nowadays (possibly performatively / to virtue signal) but corners are absolutely still cut and I've heard many jokes and seen many eyes rolled on OSHA's account.
My old man is a tradesman, qualified as an electrician, worked and kept studying as he went and ended up as senior management.
My little brother has severe dyslexia and ADHD, couldn’t even finish school so went into trades, did some time as a diesel mechanic and qualified as a welder. Now builds race cars for a living ( Dakar ) and is a senior mechanic on track for management.
Ambition and luck plays a role but although yes both of their bodies are a little more beat up than mine, they get actively headhunted and even when they don’t have a full time job they can very easily fall back on the skills they have to fill gaps, people always need tradesmen.
Neither of them are struggling in life, other than some bad decisions.
Both of them are also on most countries critical skills list and emigration has always been an option if the local market drops off.
For those reading this, trades are not nearly as bad as is being described here, there are plenty stories of SEs working for horrible companies.