I don't need a video to help me understand RAM management.
Are you sure about that?
This is 2018, not 2015. 3GB of RAM is not enough.
YMMV
Just take a look at all the speed test videos on Youtube. Every phone with 6GB of RAM performs better at multitasking than the iPhone X.
If more is better, why aren't the competitors running 64GB+ RAM?
Everything is a balancing act/compromise. Appease the customers who want a UHD display and you annoy those who want a larger internal HDD, cater to those who want to go wireless via bluetooth and you annoy those who prefer a wired analogue jack.
iOS devices can and do multitask. However, what is sufficient for one person may vary greatly compared to another person.
The OP is (likely) running apps created for 2018+ devices on his 2014 device which only has 1GB of RAM. The same argument is for complaining that the latest computer games won't work in the best case scenario (i.e. highest resolution/textures etc) on a four year old computer. Sometimes you just need to update your hardware to get the best performance. (#Insert anticipation of someone now complaining about 'Planned obsolescence')
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What about Apple adding a bit more RAM into their $1000 phones just like cheap Android OEM's do? 3GB is too little these days.
At the end of the day, it's a balancing act on Apple's behalf. The bonus is that they have the upper hand because they control the hardware and software sides of things whereas Android doesn't.
Personally, I would prefer Apple to put a bucket load more money towards the camera component of their phones i.e. increase the sensor size but that would not appease those who want a better battery life, or a better screen or a better etc.
How many people are going to be involved with using more than three applications at once on their mobile phone? If so, it begs the question, is a 4-5.8" screened device with touch input, really the best option to be using in that use case? (Example linked to mobile phones only considering the OP complaint and you're suggestion of a bit more RAM in Apple phones)