Yes and no.
Some people use a single lavalier to create high quality recordings of a single bird. If you have time and you know the favorite song perch of a Blyth's Reed Warbler, then you could place the tiny lavalier mic in that branch, within a meter or two of the bird. You would need to lay out a long length of cable, so you could sit at distance and control the recording levels, otherwise they may be too high for the recorder and then it would be distorted (assuming you don't have a 32bit float recorder). This creates a great recording because the signal to noise ratio is then very good. The only downside is that some people think this doesn't really sound like what you would hear - you don't normally hear a Blyth's Reed Warbler singing from a branch a meter away! Getting very complicated, but high pitched sound decays quicker than low pitched, so for a bird such as Thrush Nighingale that sings over a big frequency range, the balance of high frequency to low frequency sound depends on the distance from the bird - a very close recording may therefore sound too tinny, as normally you would hear reduced higher frequencies when listening from a distance.
The problem with a lavalier is that it is omni directional. It records everything around it. This means that if you set the mic 15m from the bird and crank up the recording level to compensate, you will be capturing everything in the area - a Blue Tit in a bush 15m behind you will sound like it is say alongside the Blyth's Reed Warbler 15m in front of you. You will also capture all wind noise (including rustly leaves), your grumbly stomach, distance aircraft noise etc.. With a directional mic, many of these unwanted sounds will be reduced.
The reason that up close works and far away doesn't with an omni mic is to do with signal to noise ratio. Sound intensity is inversely proportional to distance square. So if you record a Blyth's Reed Warbler 1m away, the sound intensity is 100 times greater than if you record in at 10m away. This means if you also capture unwanted traffic noise, the ratio in the close recording will be 100x better (or the unwanted noise 100x less). These figures are a bit of an exageration, as the mic may distort if the mic was only 1m away, but hopefully you get the picture.
I would therefore use a mono lavalier for up close work and you could use a lavalier stereo pair for soundscapes.
Thank you <3. Yeah I don't have a 32 float, I have only 3 tascam dr-05x-es. As I do it as a hobby and my pension doesnt allow to get expensier stuff, I try my best to do my hobby

. And yeah, most Blyth's Reed warblers I record are metre away from me, as I always try to get as close as i can. I have never had them fly away when I approach carefully, the song is SUPER IMPORTANT to me, so I do EVERYTHING to get their songs and being ultra careful! I even built lego cases for Tascams to have them on the ground still and can move them toward bird

. Same with thrush nightingales, I once tried to find it in a bush and I couldn't see the bird, but he was so loud! He did not fly away even if I had head in a push trying to find him with a phone light.
With Thrush Nightingales, as they are soo loud, I have no problem placing the recorder around metre or further.
Rütmik one I was i guess 1-2 meter away from TNG. I left the Tascam on the ground and left to find new TNG while it recorded.
The whole time the bird sang didn't move at all and was always at the same place.
Here I tried to sneak super close to a TNG and placed the recorder closer to him
Somehow the "zigizigi" sound came so satisfying and I love Ziggy for that reason. I always hear first through headphones before I drop it on the ground.
As Most are singing at night, never hear them at day here. Usually in bushes, a bush in a ditch, a lilac bush and so on. I always try to sneak very close to them, place recorder down and find 2nd bird, place 2nd recorder down, find 3rd bird, place recorder down and going around like this until 3am. When first records over 1h, pick it up, find 4th bird, record 4th bird, pick up 2nd recorder, find 5th and so on. My rule is always 1h and more to get maximum song pattern of each specific BRW to hear cool rhythms! As I want to record their amazing singing talent, so I want to get as many different inviduals as I possibly can during their 3 week singing season to hear how each different TNG, BRW and MW (Marsh warbler) sing. If no new BRWs sing, I record the ones I already got as every night can be different and a specific bird wont sing maybe tomorrow night, so each night is crucial. And it means doing it every single night since thrush nightingales start beginning of may till last BRW sing mid June. It's an amazing experience.
I love to experiment <3. So next month I try to get 1 lavalier and test stuff out.