I can see the value of this if the ratios stayed the same, so the old ones don't lose value
Current AncientLichen
Adds 3m20s, 8 levels
Sells to npc for 50k
Top level people need 19-20 of them per pot
If they were kept the same but a new version was added with the exact same ratios, just less bag space annoyance. In high level places only
Adds 10m, 24 levels (exact same as using 3 ancient lichen)
Sells to npc for 50k
Semi-rare drop in the highest level 2 or 3 caves only, for example a solo player with good kit clearing fast might find one of these every 5-10 mins or so
Top level people would need 6 of them for a pot, totally manageable
People would still buy ancient lichen, these new ones would likely have a market value of about 3x or maybe even 4x the value, as I expect the kind of people who would use them would be happy to pay slightly more for the convenience
It could work, if done carefully