There seems to be an confusion...Gurmat supports existence of chakras and using them for shabad surat marg which utilize kant, nabhi, trikurti and dasam dvaur chakar. However, gurmat discourages yogi way of meditating on chakras using pranas.
Yogis use pranas on chakras to open them.
Gurmat use "Shabad Surat" on chakras to open them and listen to anhad shabad.
Yogis have to sit in smadhi in order for pran(Vital force) to enter through via chakras and get anand. If he is not in smadhi, his surti goes down to normal level and he is affected by panj chor just like everyone else.
However, in gurmat does not have sit in smadhi after some time because with surti he/she can listen to dhuni (resosance) all the time. He can stay in "sehaj samadhi".
Actually since we are talking about it, main aim for sikh is to one with vahiguroo/ bhramgyan -gyan of atma-paratma. All the things like dasam dvar, listening to anhad shabad using shabad surat stays much below than bhramgyan. In fact, this is consider by some as - shukhsam maya as person can easily get stuck in- listening to anhad shabad at dasam dvaur, seein future/past, having all ridhya sidhya...they think at dasam dvar its ultimate reality that they don't move further towards their main aim. At that point, its only through kirpa of guru maharaj can get them out from the shuksham maya trap.
Shabad Surat Marg is parvan in Gurmat, is in fact encouraged but with keeping in mind that dasam dvar or listen to anhad shabad its not the final destination for sikh..real moksh is - bhramgyan- gyan of bhram/atma-paratma.