Much more quiet and forgiving on less-than-perfect used records. Not picking up the dirt that’s so deep in the grooves that it can’t be removed is the most significant benefit. Advanced stylus can definitely help if there is groove wear but otherwise I found no other noticeable benefits.
Additionally I was constantly neurotic about the setup of the micro line stylii that it completely sucked the fun out of it for me. I was always fiddling with the VTF, VTA, alignment, azimuth, and it was tiring I was listening for imperfections rather than listening to the music. Whatever drawbacks there may be to detail retrieval on a spherical stylus is gained by the reduced mass of the MC cartridge. The DL-103 is wonderful sounding and there’s a reason it’s been around forever. I’m not into swapping cartridges so I’m much happier having one single cartridge that sounds excellent with my entire library.
The spherical stylus cannot track higher frequencies ... and the wear from a sperical stylus is much increased on both stylus and record (due to limited contact surface area - the same force is applied over a smaller area causing wear) - also the higher frequencies where the spherical is unable to maintain contact with the groove wall due to the narrowness of the corrugations being smaller than the width of the contact patch, will cause the stylus to "skip" those corrugations - and as it lands, it will damage the vinyl surface wherever it lands - the frequencies it rolls off, as a result, will tend to be "permanently" rolled off - hence substantially increased wear of the entire frequency band, although kicked off by the higher frequencies. Mistracking, always increases wear by an order of magnitude... and a spherical stylus will always mistrack higher frequencies... it cannot do otherwise.
Alignment issues are massively reduced of course. (there is a definite ease of use benefit!)
Picking up dirt that is deep in the groove is another pure myth ultimately the tip of the stylus (regardless of the cut) ends up at around the same depth, the sophisticated cuts just provide a long narrow contact patch, with a larger surface area on the side). - And proper cleaning is always the best solution... but choosing a stylus that rolls off the frequencies that include much of the noise is another alternative
And your primary concern about being constantly neurotic about setup of ML styli... certainly isn't a comment associated with performance!
Reduced mass of MC cartridge?!? - typically MC cartridges are heavier than MM/MI cartridges, and they track at higher tracking forces.
The claims of reduced tip mass for MC cartridges, are a complete myth - as the cartridges with the lowest tip mass ever recorded were all MM's!! (Technics EPC100mk4)
A spherical stylus is a relatively lo-fi answer to a question that primarily is focused on ease of use.
If it rocks you boat, that's great.