The fact most are following this video with TEXT not sign language rather defeats the point doesn't it? How many deaf HAVE a sign language qualification? Just because they sign does not mean they are showing proof of any level pass in it. Many are not aware of the latest signs of the last 5-10years, they stick with what they knew beforehand.
Hearing interpreters are probably the only bi-lingual area, and most fluent at signing, they have to be to be understood by most, we know you will never be understood by all regardless of how many levels you attain.
The issue with levels 1 and 2 BSL is it enables you little in any real-time conversation or ability to follow e.g. current covid updates that contain masses of statistics, and charts, tier explanations and interpretations of what they mean etc, a lot of hearing struggle with them.
Having lobbied campaigned and demanded hearing learn BSL to help deaf people, learners get priced out of taking it any further, or face reluctance by deaf people to encourage them at the 'rock face' i.e. their social locations and areas, where deaf still demand hearing 'butt out' and stop invading their 'space'. Hearing have to be IN the clubs etc to get real communication happening and skills updated and is worth a lot more than 3 BSL level attainments.
Until deaf continue to improve own sign language skills hearing won't know what level is applicable. The deaf area has issues of learning disabilities, and no academic written or visual record regarding sign language either. Local authorities and care systems lowered the bar by accepting very low levels of sign qualification simply because higher levels demand higher wages and fees, but basically, care needs level 4 and above to be valid, but is level 2.
Nobody below level 4 will be able to follow sign effectively. The interpreter trend to adopt more and more aspects of Signed English is also limiting the effectiveness of BSL. But they know this enables reading text much easier. The online 'classes' of BSL (Mostly the ABC and numbers etc), probably cause issues because it is learners trying to teach other learners who are hearing like them so it doesn't come from the deaf base itself or recognised course work and tuition. The only pro aspect is that hearing are attempting to raise awareness with other hearing, as averse to the deaf who are reluctant to get involved and talking to themselves.
Regional deafies complicate it with criticisms this isn't how I use BSL etc... It is trivialising sign but the thing is sign acquisition now means a wage and a job, plays into the amateurisation of it all online. Deaf lost that leadership on sign years ago as a result. They cannot use hearing to make a job of it.