. . . The mirrorless m50 looked really tempting to me till I found my old lenses won't work. Yea there are adapters, but that's not a great solution imo.
Same problem Nikon has with their Z cameras. Have to use the FTZ adapter to use F mount lenses, until the Z lens landscape fleshes in, which will take about 4-5 years.
Same problem Canon has with the R cameras. They have to use an EF to R adapter, to use the EF lenses, until the R lens landscape fleshes in.
The adapter is a good solution for two reasons.
One, it allows you to use the dSLR lenses on the mirrorless, while the mirrorless landscape is being fleshed in.
Two, it eases/reduces your transition cost, as you can use your dSLR lenses on the mirrorless. So you can replace dSLR lenses with mirrorless lenses gradually over time, rather than having to replace ALL the lenses AT ONCE.
Where it become a problem is if you are switching systems. Such as have dSLR brand X and get a Canon M50, and there is no adapter that will let you use your brand X lens on the M50. Then you have to buy EF lenses and the EF to M adapter, because Canon does not be the native EF-M lens that you want. Same with the Canon R and Nikon Z cameras.
If you want native Nikon or Canon mirrorless lenses, you have to be prepared to wait up to 5 years or more, until the mirrorless lens landscape is fleshed in, or the lens you want is produced.
Or, you buy into a mature system that has the native lenses.