I agree not having to pay for a commute is huge, many people spend 100s a month on commuting around London
But let's not repeat myths about how if young people just stopped drinking expensive coffees, they could afford a deposit. Say someone is spending a tenner a day on their coffee and their lunch, I guess it's a couple so £20 a day. Except, you still have to eat lunch, right- let's say their new lunch costs just £1 a day, being generous here, so they're saving £18 each working day.
252 working days in a year, minus 20 further holiday days, so 232 days where they're saving £18 a day- £4176 in a year- which okay, is not nothing, but you're probably looking at needing to save a minimum of £30,000 to have any kind of deposit + fees and moving costs in the South East. That's over 7 years to save for a deposit, and I think I've been pretty generous in my numbers, in terms of what they'd actually save. And how much do house prices go up in that time? Will that be a big enough deposit in 7 years time?
There's no way people were saving full deposits in lockdown solely based on not getting lunch out. I get maybe clearing a credit card or two, but not saving full deposits.
I know people will say that you can also cut out takeaways and other treats- to be honest, for most of the young professionals I know, these things are a pretty rare treat these days. You're looking at, let's say, 5 years of literally having no treats at all, hoping you have no financial disasters, hoping your landlord doesn't whack up your rent or evict you, to save up a deposit, which, by the time you get it together, may not even be enough.
It really isn't as simple as saying that you can "be more frugal" and everything will be fine. In reality that just isn't how it works at all. Most FTB now will have had either some kind of family help, whether that's a gift, inheritance, being able to live at home for longer, or a windfall from some other source e.g. big bonus at work etc- at least to get them started with their savings. They'll likely have put in some of their own savings on top- but unless you're a very high earner, it's very, very hard to save enough in many areas of the country whilst renting- and the more rents go up, the harder it will get.