doesn't work that way.
trust me..
you can't simply connect the 2.1 speakers to the ps4 controller headphone jack.
need dac and toshlink cable.
Simply think switch is like tablet. If tablet can run your 2.1 speakers, switch shouldn't be an issue
Actually you need to compare apple to apple. As a handheld, the Switch has to have a earphone jack (just like Vita, mobile phones, 3DS, except the Gameboy I think, which has its own connector, not standard 3.5mm). And for this purpose the Switch's earphone jack is badly placed cos the earphone cable will dangle across the screen.
As a home console, there is actually no need for a console itself to have earphone jack (just like DVD/Blu-ray players dont have it). Your TV or amp/receiver is your entertainment center's audio hub, with multiple audio/visual sources coming into it (console, DVD/BD player, set top box...). If you have external speakers, you would connect it to TV's audio output (3.5mm or optical or HDML ARC) or the amp/receiver, whichever is your audio hub. Why would you have 1 set of speakers connected specifically to a console only (and then perhaps another set connected to DVD/BD player, another set connected to set top box...). For this purpose, the ps4 or switch does not need earphone jack. In fact there is no guarantee that the 3.5mm jack on the Switch will still output audio when it is docked, cos logically it shouldn't.
By the way the PS4's controller does have a 3.5mm earphone jack, if you want to use earphone. You can also connect external speakers to it as well. Now Xbox One also copied that and have 3.5mm jack on their revised controller.