yes. but remember the rsf are way more battle hardened compared to the sudanese elites who control the saf. and they arent some ragtag militia they are estimated to be 100k. and they have almost unlimited money. sudanese elites and saf werent getting their hands dirty like the rsf.
That's all true, however, a drawn out conflict is never good for the side that has a smaller population with which to draw upon; I am certain that the RSF thought that this was going to be concluded rather quickly -- presumably after Burhan had been killed or captured.
The RSF were permitted to strategically position tens of thousands of their troops in Khartoum-Omdurman, so they never had to fight their way to the capital; all of this happened because they were permitted to control lucrative gold mines (worth billions of dollars) in both Darfur and the Northern States...
..The RSF had been permitted to initiate, negotiate and conduct their own obscenely lucrative foreign adventures; and these wars turned them into a formidable fighting force.
The RSF now has to capture the bulk of the population centres and deprive Burhan the opportunity to effectively mobilise any further; and has to ensure that the SAF is not afforded the breathing room to truly train their forces and learn from their mistakes.