Anyhow, I think the OP's question has been answered, don't you?
Recitation of the Quraan has an actual physical effect on the hearts and ruh of people (reciters and listeners). Take the example of Umar Ibn Khattab RA and the manner in which his heart changed in favour of Islam after his encounter with the few verses of the Quraan.
There are some verses, noted via the experience of pious people throughout the past till present, that are known to have a more 'powerful' effect than others.
For example, there's Ayat-ul Kursi. This is seen as a 'jalali'/powerful verse. It can be recited to protect against and ward off jinns/shayateen and it will do this job.
However, reciting too much (say 5000+ times a day) of a verse that is extremely powerful to begin with may lead to reciters experiencing some undesirable effects. In such quantities, it may be too much to handle. An overdose.
There are numerous anecdotes related to people going mad or insane after doing such lengthy unnecessary and strenous sessions of dhikr.
Hence, scholars of the sub continent have taken the precaution of informing the lay public on the powerful nature of some verses and advised against excessive recitation of them.
That's the fact behind this jalali stuff. Nothing bidah there.
There has been no observable undesirable effect of excessive sending of salawat on the Prophet Sallalahu Alaihe Wassalam and usually quite the opposite has happened throughout history (i.e. nothing but good has come out of it), hence it is seen as 'soft' and always promoted.
That's just my understanding. Allah knows best.
Remember, dhikr is one of the few things in the Qur'an, which is prescribed to do much and in abundance. However, while we always think of dhikr as being on the tongue, remember it can be in the heart too, eg when you are remembering Allah without actually saying any words.
None of us is suggesting that we should do dhikr 100% of the time, but neither should we suggest that doing a lot of dhikr can be bad. If we want to warn, then we should say that doing dhikr in a way not sanctioned by Qur'an and sunnah, is bad.
If dhikr is done in accordance with the Qur'an and sunnah, (and that includes abundant dhikr as mentioned in the Qur'an), this should be the effect:
أَلاَ بِذِكْرِ اللَّهِ تَطْمَئِنُّ الْقُلُوبُ
"Verily in the remembrance of Allah do hearts find rest." (Surah al-Ra'd, Surah 13, part of ayah 28)
And Allah knows best in all matters, and may He forgive me if I said anything wrong.