Goldenbear telling everyone who doesn't agree with you that they don't have a clue is getting very old - you are not the only parent of teenagers in the room.
This is originally a thread about time not money. If teens are expensive (and they potentially can be money pits) this is a reason to work instead of staying at home - in reality most people are more able to afford to pay for things for their children if they both work than if one parent gives up their salary. This is completely obvious - if the argument is that teens are expensive and that not finding them to the tube of ten plus thousand pounds per child per year is neglect, then both parents of teens in ordinary families will need to be working full-time.
If what teens need is time, requiring the sacrifice of a salary or the restriction of one parent's earnings to whatever can be earned in the hours the teens are at school, then in ordinary families the money will not be there for all the optional extras.
I have three teenagers, so your virtually yelling that nobody but you has a clue is making my eyes roll excessively - there are phases which are expensive, and phases when one or other needs more emotional support, but the time intensive phases do not require anyone to stop working (that's an extremely unusual situation which sadly can happen when children have serious mental health problems or obviously serious physical illness, but it is absolutely outside the normal parenting teens experience) most of the expense could be reduced if actually necessary.
Driving teens around if you live somewhere with poor public transport and where things aren't walkable is a big time and petrol commitment but public transport to school, cycling to sports training and friends' houses, and car pools and lift shares for fixtures further away definitely are the way most families we know do this. We've been involved in football match lift sharing for over twelve years now - it's the only sensible and practical option when three children sometimes have separate matches in totally different locations on the same day!
We pay are paying for the second set of driving lessons now - getting three teenagers through driving tests beginning to end is very expensive BUT we don't actually have to pay for that, we see it as part of their education and "launching" our offspring as competent, self sufficient adults and so choose to be responsible for funding it - if we couldn't afford it we'd cut that expense out though.
Babies and toddlers have to be cared for 24/7/365 and either losing an income or paying for childcare or a mix of the two will cause an unavoidable family budget deficit (whether it's money not earned or money spent it comes to at least £800-1000 per month for the first/ oldest currently under 3 year old with potential temporary "free" siblings in a situation where the parent is caring for multiple children). It is difficult to understand why you don't understand that this is different to funding worthwhile and important but avoidable costs for older teens (and of course university is the very end of the teens plus 20+, most of the teen years are school days not university age, and in reality going immediately to university no matter what isn't actually the right/ most sensible/most long term financially astute choice for many/ most people at 18).