Sorry but do you actually have any evidence for sucha claims for Switch also? Beacuse information we have about 3rd party sales on Switch is that they are selling quite good. Actualy Activision, EA, Ubisoft, Take Two seeing Switch primarly like handheld is a plus beacuse they can port their games on Switch and to be avalible in full handheld mode also and that gave extra value to those games, we have alredy games like Skyrim, Doom, La Noire and Dark Souls Remaster that were not on handhelds before.
I tottaly agree about your second part, I think Switch will have strong 3rd party support for Nintendo platform and there will more and more 3rd party announcements for Switch, but it will never be on pair of PS/XB
I guess I should have specified Western third parties. Going by VGChartz
|Lego City Undercover||0.38m||0.15m||0.33m|
Lego sold better, but it was originally a Wii U exclusive, so that's more or less expected plus Lego usually sell pretty decently on Nintendo hardware, likely due to the younger demographics. I don't really have many other good examples for comparison considering that most western third party games on Switch so far are late ports, so direct comparison is unfair. Going by the games that you mentioned (and some other late ports):
|Skyrim (First 2 weeks)||0.24m||0.47m||0.81m|
|DOOM (First 3 weeks)||0.16m||0.29m||0.65m|
|Dragon Ball Xenoverse 2 (First 10)||0.18m||0.27m||0.91m|
|Lego Worlds (First 10)||0.15m||0.20m||0.37m|
|Skylanders Imaginators (First 10)||0.02m||0.14m||0.24m|
Now are these most of these bad figures? I wouldn't say they are, but beyond L.A. Noire (for some reason), all of them are unquestionably lower than XB1/PS4. Now is that fair, considering the Switch's significantly lower install base? Again, not particularly. Still the point remains that major third party games sell less on Nintendo hardware.
As for the developers touting high sales on Switch? Those are almost universally indies. You see Team Meat and Team17 happy. Do you see Bethesda touting how successful Doom or Skyrim was? EA with FIFA? No, because they weren't impressive. I want to be crystal clear. I do not think that indies are lesser. I do not think they are not important. They aren't lesser and they are important. HOWEVER, indies need lower numbers for the Switch to outsell other consoles, something that is greatly helped by the lower quantity of games on the platform. An indie selling 10k is a success, 100k massive, 1m unthinkable. But EA, Ubisoft, Square Enix, etc? Needs more than that.
All of this is on top of what many others here have said, that porting to the Switch takes time. If a game started development in 2015/16 for release in 2017/18, most AAA's literally CAN'T have a Switch version ready around launch.