"most buy to let people only have 1-3 investment properties"
That's still 1-3 more taken out of the hands of owner occupiers! This multiplied by the millions of buy to let people is a fucking huge amount of the housing stock.
"If they tax buy to let more I might sell up and that's less homes available"
The house wont cease to exist if it's sold! It may give the chance for someone to buy it and feel like part of society and be more invested in the local area as they can put down roots!
"I didn't have a smartphone"
They didn't exist! The generation before you also didn't have access to modern recently invented things. Most cost a few quid a week on a and are essential these days.
"I didn't have fancy avocado toast, I had oats for breakfast"
Avo toast on sourdough costs about 50p a portion made at home. Porridge with some fruit isn't really that much cheaper
"I've worked hard for every single penny I have, other people could do the same if they weren't lazy"
When their house makes more money than they do each year and other people certainly could not do the same now!
I'll stop now