Except for the games that actually have that

you're highlighting the issue, it should be a standard feature and party chat should be on the console.

Because it doesn't need them.

Nor does any other video game system. I have like ten devices that are better suited for the streaming apps already. I'd rather have my system clean.

What about people who don't have 10 devices or a smart tv, these days you can customize your dashboard to make it as clean as you want it. Having an additional feature like these apps is not and never will be bad. I like my Switch but it really is lacking in basic features.

not needed I'd rather use my Roku for streaming anyway my consoles are used strictly for gaming

This "purity" arguments of keeping gaming devices clean makes no sense. If this was the point TVs would be only to watch broadcast shows and mobile only to make calls

The ideia of a multimedia device is good regardless of what the system was mainly designed to do. I'm sure nobody here think it's a bad thing listen to music in smartphones, why would be a bad thing listen music in your Switch?

In reality it's something I would love, plug my phone on my Switch and run Spotify while I play something, currently I need to plug it on my smartphone or PC and keep both devices active to make it work 

I think what's being missed here is that of the 3 main companies in the home video game sphere, 2 of them are multimedia companies, and the other is primarily a video game company.  Sony and Microsoft have a vested interest in trying to dominate your living room in order to sell you on other products.  Nintendo isn't trying to also sell you a TV, PC, phone, DVD/Bluray/digital movie, CD/digital music, etc..  They just want you to play their video games.

1. Laziness
2. They don't want to worry about licensing agreements
3. They want Switch in almost every application to be a gaming device. Xbox and PlayStation are mostly gaming devices, but they have tons of ways to access video and music.

The same reason consoles dropped browsers the are devices better suited for such apps than a games console. 

Ok, but I want my gaming devices to be more useful than just a gaming devices and what about it? 

Will it hurt anybody to have an option to download other apps? Will it make Switch any worse? Is there any reasonable reason to be against it?