Just tried to install Ubuntu 18.4LTS alongside my windows 10 install, imagined it to be rather smooth an painless process

, boy I was wrong.
I've installed and used a couple of versions both Ubuntu and it's light weigh cousin Lubuntu, both times it was a straightforward fresh install on a wiped hdd.
Now for a couple of reasons I wanted to have it installed alongside my windows 10 install.
What could be difficult here I thought?, convincing a windows user to switch to Linux has to be one of the most important (if not THE one!) priorities of the Ubuntu team, I'm I right here?
My reasoning: to bring people to the (dark

) side one has to make it easy first to try the product then to convince future converts that the Linux is a better or at least not inferior choice.
After all it is free

.
So in my naivety I fired up a freshly downloaded 18.4lts image from a USB stick hoping that given the above the installer will somehow automagicaly allow me to create a new partition and install ubuntu there without much intervention, guess not.

OK. I gather I have to resize my partitions beforehand, done.
I have a fresh empty partition ready to accept my new Ubuntu install, I'll fire up the installer, point to the empty space, hit install and voilla!! ,

you guessed.
Instead of accepting the destination, and doing all the "necessary" prep work all by itself, I'm being bombarded with options to create extra partitions, formating options that let you choose from like 20 different filesystems?

How the f#uck I'm supposed to know what partitions to create, how many, and what's the mount point?
I know that there are guides on the net regarding this, but why, I mean WHY the geniuses at Ubuntu didn't think of doing it somehow easier for the first time potential convert?
Couldn't the installer somehow interactively guided you through the process? Is it to difficult a programming task in 2019?
Or is the secret goal of all the Ubuntu programmers to keep the Linux acceptance at below 1.5% mark?