The only valid reason to make a new L1: 

a) You want the influence that only an L1 has
b) You want to use this influence to create a new asset category

A GREAT reason 

Should be used instead of technical reasons that are closer to sleight of hand than anything:

1. Doing something new? 
 >> That's an execution layer improvement- what L2s are for

2. Faster finality? 
>> Finality for validator set becomes preconf for decentralized sequencer set, w/ no deterioration in reorg resistance

3. Higher throughput? 
>> Probably won't outpace danksharding roadmap with real tx demand 

4. Better decentralization?
>> Lmao will the bottleneck really be Ethereum's decentralization

founder @seismic // product-focused cryptography // rookie years @ stanford, google

Lots of alt L1s today make a ton of sense!

For the reason of influence

Not due to any technical reason